It is good practise and should not be ignored. Given the wiring gauge, I’d feel better splitting the 4 lamps into 2 9A circuits, but I’d like to control them with the same switch so I don’t have to go through the firewall and install another switch. The other lead is connected to +12V through another switch. Wiring Your Off-Road Lights with a Relay Identify the four prongs with 30, 87, 85, and 86. Pin 86 will be connected to the existing wire that feeds your high beam. Most companies offer wiring kits with their products, and If your not familiar with wiring accessories then you should buy the wiring kit. They’re real cheap and should never be overlooked. This is caused by the amount of power being drawn by the high output lights or accessories. And except for primary circuits, those three sizes will cover just about anything you want to wire in a truck with an adequate safety margin. These may already be plugged into the wiring harness and switch. The wire coming from the switch would go to #86 on the relay. Start by drawing the switch portion of the wiring from the passenger side to the driver side for ideal cable management. HD-MAX LED Light Bar Wiring Harness Off Road Relay Switch (40 Amp / 500w) HD-MAX LED Light Bar Wiring Harness Off Road Relay Switch (40 Amp / 500w) OPT7. The coil of an SPDT relay that we most commonly use draws very little current (less than 200 milliamps) and the amount of current that you can pass through a relay’s common, normally closed, and normally open contacts will handle up to 30 or 40 amps. The #86 prong connects to the power source used to control the LED light bar, such as connecting it to the high beams or reverse lights. Let’s assume you have to run a wire 6 feet from a relay to the lamp and look at this chart. The relay above is a SPST relay with dual outputs. For the switch, you run power to the switch then to the relay on 86. Then I run a single heavy gauge wire out to the lights or other accessory. This relay is similar to a SPST, but pin 30 is switched to either output pin 87A or pin 87. How to Wire a Relay for Off-Road LED Lights Some equipment is rated in Watts – mostly the lighting equipment. Just connect your lights to your batter and flip the switch. To speak with a Parts Specialist, call or text 317-93-G0-SPV or email us at info@spvparts.com, All Ford F-150 Light Kits (Includes Roush), Ford F-150, Raptor & Roush Fog Light Kits, Ford F-150, Raptor, & Roush Light Bar Kits, Back-Up Light Kits For The Ford Raptor, Roush, & F-150, Power Adders & Tuning (Ford, GM, Dodge, Totota, Jeep), Ford F-Series And Raptor Accessories (Including Roush), Ford Ranger Accessories (Including Roush), Ford Mustang Accessories (Including Roush), Ford F-Series and Ranger Brackets and Mounting Hardware, Ford F-Series, Raptor & Ranger Harnesses/Connectors. Using the 10 ft. length column you’ll find that you can run 15 Amps on 10 feet of 18 AWG with only ½ Volt drop. We do not endorse any such activity for others or recommend it to any particular person – we simply describe … With our wiring harness, all you need to do is cut the wire coming from the switch to the 30 prong on the relay, and wire it to your high beam lead or your backup light wire. The #87 prong connects to the positive side of the LED light. Then run a heavy gauge wire from the battery to the relay placing a 30 Amp fuse in line very close to the battery. Whenever wiring off road lights, it’s important to add a relay to the wiring. In an automotive electrical system, these formulas are easier since a constant of 12V is always present. MSRP: $49.95 $34.99 (You save $14.96 ) SKU: LED Light Bar:WHLB3 UPC: Current Stock: Quantity: Decrease Quantity: Increase Quantity: × Description . Switch line: 1 meter. the line you spliced off your high beam wire or your backup light wire. As for how to wire it, the switch powers the relay and the relay powers the lights. Whenever wiring off road lights, it’s important to add a relay to the wiring. Everything you need for a simple installation is included, and the quality construction of the wires will keep them delivering light for years to come. I personally won’t wire lights with anything less than 12 AWG. We also suggest adding a fuse. This H4 Relay Harness will plug into your factory wiring harness such as on the Suzuki Samurai and Toyota vehicles and will be able to provide the power needed for your upgraded headlights from IPF, Hella and others. We are also on call 24/7. You are going to tap one of the two 8" wires into the ground wire (white). One end of the power relay's electrical coil is connected to ground. Now connect a wire between the batteries’ positive (+ / red) pole and pin 30 of the relay with the bakelite fuse holder in this wire, but do not insert the fuse yet. If you have any doubt about how much power an accessory will pull then add a relay. Anytime you want to switch a device which draws more current than is provided by an output of a switch or component you’ll need to use a relay. For the best LED Ford Raptor fog lights and light bar kits, look no further than Specialty Performance Parts. How do I wire up 2 relays controlled by one switch? Step four: Locate the offroad light relay. Most aftermarket off-road lights come with a wiring harness that actually includes two correlating circuits. Call today at (317) 93-GOSPV ( 3179346778 ) and we can customize a one of a kind look for you. Run a ground from 85 on the relay. We’re always looking for new information as well as modified Ford Rangers to share with other Ford Ranger enthusiasts. With the 0.5 volt drop shown in the chart, you have 13.0 volts available at the lamp – and at that 95% rated voltage, you are only going to get 80% of the rated output – or the equivalent of 80 watts from a 100 watt lamp. In the example you would go to 14 AWG as the wire and connectors are physically stronger, easier to work with, and there’s no voltage drop. When +12V is applied between pins 85 and 86 the coil becomes a magnet which pulls the lever down making a connection between pins 30 and 87. This is a SPDT (Single Pole Double Throw) Relay, This is a SPST (Single Pole Single Throw) Relay. You can safely alter the #85 and #86 prongs if wanting to wire the light bar in a unique way. Now take the other output terminals and tap the white terminal wire to the positive red wire and tap … For lighting, the rated output is figured at 13.5 volts, not 12 volts. When the coil is energized, the common terminal (30) and the normally open terminal (87) have continuity. Some even include the kit with the product. #85 would be sent to a good ground, and #87 would go to you accessory or light. The first thing you have to do is determine the current you have to carry. © 2021 The Ranger Station - 959 Media LLC, Driveshafts, Transmissions & Transfer Case, https://www.youtube.com/watch?v=eqaZGcLBvvE&t=147s, Current in Amps = Volts/Resistance (Ohms), Current in Amps = Square Root of (Watts/Ohms). Using Relays To Wiring Off Road Lights And Accessories inside 12V Relay Switch Wiring Diagram by admin From the thousands of images on the net with regards to 12v relay switch wiring diagram, we choices the best selections together with ideal resolution just for you all, and this pictures is actually considered one of images libraries within our greatest graphics gallery with regards … Those three and crimp-on connectors are readily available just about anywhere. In this case, you need to wire the dash switch in between the trigger current, i.e. Here’s a short guide on how to wire a relay for off-road LED lights that will give you greater illumination power wherever you are. Please let me know if there is anything that i have missed. Using the relay diagram above, you can see that you can run a fused wire from your fuse block (Accessory jack) to a toggle switch at the dash. Fortunately, there are some projects any pickup truck owner can do to enhance their vehicle’s performance. Pin 87 is connected to the positive wires of the spotlights. With our switch harness, all you need to do is cut the wire coming from the switch to the 30 prong on the relay, and wire it to your high beam lead or your backup light wire. After all, they don’t want to damage or mess with the truck’s mechanics and specifications. Specialty Performance Parts provides industry-leading custom accessory solutions for your Ford F-150, Ford Raptor, and more. These are getting harder to find. Identify the four prongs with 30, 87, 85, and 86. Simply hook up power and ground and then connect your old headlight plugs into this harness. Locate the rubber cover on the driver side and open the firewall cover. 10. Failure to do so would cause excessive heat in the wiring and switch and create a risk of fire. Keep this wiring in mind if you pick up (2) 100 watt KC Highlites and want to bolt them on. That’s why you read this page. I just finished hooking up a similar system on my truck, but my wiring was a bit diferent.. i purchased a 300 watt relay and jumpered the bright light switch wire (goes from the turn signal to the light relay) to the switch side of my off road lights relay. The relay acts as an electrical switch that activates and draws power straight from a good fused battery connection and sends it to the lights or accessory. Install switch in cab. You will have to adjust the current ratings for the light you are using. Generally you’ll have a larger gauge wire going to the lights than to the switch because the lights pull much greater power. Your old plugs power the relay to put full power to the lights for ultimate power! 【SAFETY】: The wiring harnesses kit with relay and high-current injection molding fuses, safe and secure in using. This is caused by the amount of power being drawn by the high output lights or accessories. Stay up to date on the latest product releases, special offers & news by signing up for our newsletter. Disable the terminals on the short output wires with electric tape unless using both terminal sets. If your lights do not have connectors included, strip a half-inch of bare wire from the end of each power wire using your wire strippers. 14, 12 and 10 AWG is what you should be using in your truck. For the lights, run from the battery to the relay (30). These kits retain your OEM appearance while still enhancing the lighting through fog amber, radiance 360 or reverse, bumper-mounted, and lower grille LED light kits. For example, if you want to wire the light bar controlled to a separate switch, cut the #30 prong and then wire the light bar to the wiring harness. When that switch is turned on, the current flows into the electrical coil and creates a magnetic field. For DC circuits, that’s relatively easy. How to Wire a Relay for Off-Road LED Lights. As for wire gauge, I would run 14 gauge on the lights. These may already be plugged into the wiring harness and switch. Its actually two completely different circuits that help each other. To come up with amps use one of the formulas shown. Pin 87A is connected in the unpowered state. If your light has a very large amp draw at all, you will want to install a relay switch to keep from overheating an ordinary switch, burning up the wires, and thus reducing the amount of electricity getting to your light. A heavier gauge (At least 12 Ga.) wire with a fuse would come off the battery and go to #30. Use connectors if they are supplied with your lights. One of these is wiring off-road lights. I have written a how to from memory but I might have made a few technical mistakes. The #30 prong connects to the positive battery terminal or an alternative power source when the vehicle is turned on. Do-it-yourself installation can be unnerving for inexperienced truck owners. When the switch is then flipped it carries the current though the white wire that trips the relay and allows current to flow to the lights and boom they light up. OPT7 LED Light Wiring Harness is compatible with all vehicles or boats that use a 10-30v DC power source. SPST Relay: (Single Pole Single Throw Relay) an electromagnetic switch, consist of a coil (terminals 85 & 86), 1 common terminal (30), and one normally open terminal (87). Slide each end in a crimp-style wiring connector. I assume two15A fuses, one for each pair of lights. The power requirement in Watts will be printed right on the bulb or stamped in the base. When you’re looking for a lasting solution to wire extra lighting to your vehicle, the DV8 Offroad Wiring Harness with Relay and Switch are exactly what you need. Control the power of your new light accessory without having to splice wires. I need some help here. When the coil of the relay is at rest (not energized), the common terminal (30) and the normally closed terminal (87a) have continuity. Basically any car battery will work on this wire harness. How to Wire a Relay for Off-Road LED Lights – Extreme Lights We frequently get asked “should I install a relay with the lights?” The answer is YES! For your roof lights you can wire both relays int one switch. DV8 Technology. If you are using a light pod that does not have a very large amp draw, you may not need a relay switch, but if you are using a larger LED light bar, they are a must have. Failure to do so would cause excessive heat in the wiring and switch and create a risk of fire. We carry top brand lights, like Rigid, KC HiLites, and Baja Designs to give your truck the illumination power it deserves. Go to the next size larger for safety margin and you’re at 16 AWG. Disable the terminals on the short output wires with electric tape unless using both terminal sets. Match the numbers on the prongs to their respective destinations. The switch comes with double sided adhesive so you can place the button anywhere it’s convenient. SPDT Relay: (Single Pole Double Throw Relay) an electromagnetic switch, consist of a coil (terminals 85 & 86), 1 common terminal (30), 1 normally closed terminal (87a), and one normally open terminal (87). Do not connect the power to the battery until all wiring is done. Take a Fused power wire to the switch (low amperage is ok, and preferred here) Run a wire from the switch to the relay. Now in reality, you have to balance the mathematical results with mechanical reliability and efficiency. Why do I want to use a relay and do I really need to? One 40 amp relay should be sufficient, but if it is not, then split the wire from the single switch, to the second relay. Let’s calculate for a typical 100 watt driving light – the power required is 100 Watts and the voltage is 12 Volts – so the current requirement is 100 Watts/12 Volts = 8.33 Amps. Remove the connectors to the offroad light switch and side mirror adjustment. The How-to can be fond here. Ground the relay, and the lights. A relay works by using a switch to run 12 volts to the relay. Connect the wire from your switch to the power wires on your lights. In some cases you may need to switch multiple things at the same time using one output. Feel free to browse our site. This allows you to switch devices such as headlights, parking lights, horns, etc., with low amperage outputs such as those found on keyless entry and alarm systems, and other components. The power actually going to the switch never gets routed to the lights. If installing lights, split it into two leads at the lights. Switch control line: 3 meters. Aim your lights slightly above your low beams at a distance of 25 ft and tighten the mounting hardware. Auxiliary fans, fuel pumps and things like that are rated in current draw – Amps. Lastly, the #85 prong connects to a grounding. the wiring harnesses is 2 meters. A relay works by using a switch to run 12 volts to the relay. It does not have a normally closed terminal like the SPDT relay, but may be used in place of SPDT relays in all diagrams shown on this site where terminal 87a is not used. Relays can be found by the light and electrical part of the automotive sections. Use the T-piece connector to join to this wire. Insert the switch from the engine bay into the interior. Dec 2, 2018 - DISCLAIMER: Activities and vehicle modifications appearing or described at The Ranger Station and it’s pages may be potentially dangerous. Then, connect the battery terminal on the relay to the battery with an inline fuse large enough for the load. Check out our selection today along with our amazing deals on any of our most popular choices if you are looking to wire a relay for your truck’s off-road LED lights. Connect the wire coming from under the dash to the switch terminal on the relay. This magnetic field causes the mechanical … Step five: On the wire that's tapped into the relay, attach one female wire connector. You’ll have to install the switch yourself if using an alternating current. A single output connected to multiple relays will allow you to open continuity and/or close continuity simultaneously on multiple wires. The relay to the work light line is 3 meters, to the battery is 0.5 meter. Some equipment on a car is rated directly in current draw. Most of us are cheap by nature and always looking for low-buck-do-it-yourself upgrades. Total, you're looking at about 60 amps of current draw, so you are definitely going to need to upgrade to a 140+ amp alternator to safely keep your system topped off and charging properly. How do I correctly fuse the whole install? • Run the appropriately colored wire out of the relay through the firewall and on to the other terminal on the dashboard switch. Here are two diagrams showing you how to connect them using a relay. 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