Upgrading to 80-100 watt bulbs definitely requires the use of relays. For auxiliary low beams: connect the positive lead to the headlight positive wire before it feeds into the high/low beam selector switch. Pin #30 and pin #87 (Normally Open) are connected. It would seem to me that the 85 PIN basically wouldn’t be grounded to anything if I’m using the key (because it’s connected to the R/S which isn’t doing anything). Additional Notes: the Anti-Theft Bypass Module Blue Wire is connected to the R/S Yellow/Black Wire before the PIN 85 connection. In the back of the radio, I connect to pin#7 that will sense the EMERGENCY call. When the relay is off, the common and Normally Closed contacts are connected. 30 fused 12 volts Relays are an important component in wiring fog or driving lights with a 30-60A draw. Instead, wire a 12 volt positive lead from the nitrous arming switch to the switch's N.O. 0 332 019 150) lying around with the following configuration 30, 85, 86, 87 & 87(NOT 87A). I know a decent amount of electrical to do basic wiring, and don't understand why the relay is necessary. He's getting ignition switched power on pin 30, which with the relay de-energized sends power to his fogs being used as DRLs via 87a, the normally closed pin. You can string along several interior cabin LEDs and not pull a lot of amperage, or conversely, a pair of high-output off-road lights could draw a significant amount of current. It is possible to hook the fog lights up to the main fuse and relay box under the hood, although the degree of difficulty is much greater. The switch in the car takes hardly any power or amps and turns the relay on or off. That way, you can wire “pin 86” to receive voltage from (for example) the vehicle’s ACC switch, so when you turn the key to the ACC position, the relay will energize and switch to the alternate pole. I’m looking at your diagram showing the electric fan control. i am installing two fog lamps on a classic mini. 2010 … Another type of relay is the single pole/single throw (SPST). Mind you all the wiring is Yellow in colour from the washer unit. Thanks VERY MUCH for an Email reply! My question is-- why is everyone saying in every fog light thread that you need a Bosch relay with an extra fuse? Pin #30 (common) and Pin #87A (Normally Closed) are connected. When I turn the key, it sounds like it’s trying to start but can’t. If you use a vehicle’s stock wiring and switches to control aftermarket devices like high-output lighting, relays will not overload or stress the OEM components. Relays can help you make an electrical system perform better and run reliably. ’88 ford festiva L. under the hood are 3 electrical relays in a row: 2 “browns” with one “red” in betrween. The second 12 volt positive lead from the on-off switch can connect to an ignition-activated system to give you manual control. Recently finished adding LED fog lights to my ZR2. If local laws require the auxiliary lows to turn off when the high beams are on, connect the positive lead to the low beam positive wire. Does the remote start unit have a separate wire for ground? Here are the details followed by my specific question(s): Make sure the band on the diode on the ignition wire (which prevents power from going back through the system when the ignition switch is turned off) is facing the relay. And, when I crank the Ignition Switch with the key, wouldn’t the relay send power to that 30 PIN, thereby triggering the switch from the 87A PIN to the 87 PIN (which is connected to nothing)?? Your email address will not be published. Pin #30 is the common switch; it moves between pins #87 (Normally Open) and #87A (Normally Closed). There are 4 fog lights, each 55 watts, which is 220 watts total. You’ll need to power it with (in a typical automotive application) 12 volts–most often the vehicle battery. Electric Fuel Pump? It has a #30 pin (common) with two #87 pins (Normally Open) that are connected internally. Note before that I stated a “Fused Headlight Circuit“. Once you use them, you’ll wonder what you ever did without ‘em! The diode prevents the voltage spike of relay deactivation from harming computers and other sensitive electronics. My two questions are the fuse built into the relay which side does it protect? At least I have been able to clean the wires & could find that they were printed on close to the terminals ie: 71-4, 71-2, 71-1 I could not see a 71-3 anyhoo I’ve managed to isolate them & get the right combination to work just from the car battery.71-4 Hi speed, 71-1 Lo speed, 71-2 could be park-not sure & the other wire going to ignition without any marking other than yellow/green elect. 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. Pin 85 is ground. I’m just worried about the current going beyond the reverse light into the fuse box/computer/etc. I have an Ol’ 1971 Dodge Ozzy built RHDrive -Ute/Pick up as you Americans word them, an AT 4, C1100 which I’m trying to complete its been an 8 yr part time project. I have several 30/40 amp spdt bosch style relays, what is 87a used for? If you’re referring to the relay’s switched voltage line (pin 86 in the the dia. Thanks! The pump is activated only when the nitrous system is armed.Auxiliary Lighting Wiring Diagram: This is a typical auxiliary lighting circuit. Now the vehicle won’t start, even using my factory key! This diagram shows how another type of relay, the single pin/single throw (SPST) operates. above) you can run a single wire to each, as it’s low current draw–good if you want to energize a group of relays with, say, your ignition key. The timer is available pre-made, or can be made from a "555 Chip" available at your local Radio Shack. In Other words, If the Car has an Electric Seat!!?? Electric Fuel Pump Wiring Diagram: When wiring an electric fuel pump, we strongly recommend using an oil pressure cutoff switch for safety. One last general question is, which of the 5 pins on this relay are considered inputs (85 and 30? They are meant to help the driver see the edges of the road when visibility is low. I ran into a problem. Question – can I use the positive side of the coil to power up an electroic fuel pump ? just an idea on how to understand the automotive RELAYthanks for watching Would these relays be fine to use or could you recommend another constructive method? Only problem I’m seeing is my key wire is only putting out 9v instead of the 12v. A relay is an electrical switch that lets a low current circuit control a high current circuit such as a large LED light bar. You should, for a couple of different reasons. Make sure the ground wires for the new bulbs is at least 14-gauge. I could just take out the relay, but I’d rather understand what’s going on. What do you use to power pin 86? Your email address will not be published. Instead, wire a 12 volt positive lead from the nitrous arming switch to the switch's N.O. Larry, generally speaking its best to control the relay through a ground if possible. /* Test for voltage going out to the fog lights 'from' the relay when the switch is turned on! When the relay is engergized the common is switched over to the Normally Open contact. Answer to second question, when you turn the key to run, the relay sends power form Pin 30 and switches power from Pin 87A to Pin 87. How to Wire a Relay for Off-Road LED Lights – Extreme Lights That’s not the issue. Someone please help me with this. For fog lights: connect the 12 volt positive lead to the positive wire on the parking lights. YMMV. First, it will help reduce the amount of load on your headlight circuit. Direct power from the battery and no risk of overheating the switch and wires. Basically, the relay protects the switch from getting hot and creating unwanted resistance. Pins 85, 86, & 30 I would consider inputs. First answer to your question about Starter Output. https://lotusmarques.com/images/lm/Europa-wash-wiper-switch-wiring-diagram/europa-wash-wiper-switch1r-wm.jpg How about just using a fuse block (like https://flic.kr/p/2h2QAir), and using the switched 12VDC+ as a power source for the fuse block? I added a Bosch Style relay (for anti-grind) to my ignition harness wiring while putting in my Remote Starter (“R/S”). The second 12 volt positive lead from the on-off switch can connect to an ignition-activated system to give you manual control. High Wattage Headlights Wiring Diagram: This diagram is fo using high-wattage bulbs with stock headlights. This also applies to your High Beams and Fog Lights. Use diods to prevent flow in the opposite direction. This allows the auxiliary beams to be on when either high or low beams are on. For auxiliary low beams: connect the positive lead to the headlight positive wire before it feeds into the high/low beam selector switch. Respond back if you’d like clarification. ), and which are considered outputs (86, 87 and 87A?) right. The fog lights are lights underneath the headlights that are designed to improve visibility in dense fog or rain conditions. (ACC/RUN/START) I’m pretty sure I wired up my relay correctly. This type of relay allows you to wire two systems (such as a pair of lights) to activate at the same time. i have an Save my name, email, and website in this browser for the next time I comment. I am currently working on a 1953 Desoto and a 1954 Kaiser. This circuit diagram of an inactive SPDT relay with no power applied to pins 85 and 86 (ground and 12 volt positive). (Some relays have a fuse inside of them. This system retains all stock light controls. Before cutting any wire a good diagram is in order. Our lowest amp draw LED light pod has an amp draw of about 1.4 amps. That’s the pin that receives power to energize / de-energize the switch. A timer setting of 5 minutes should be plenty for most engines. Upgrading to 80-100 watt bulbs definitely requires the use of relays. The reason it still works is because Pin-30 is normally closed to Pin-87A. As you are very savvy in the auto field I thought I’d ask if you may be able to assist. Pin #30 is the common switch; it moves between pins #87 (Normally Open) and #87A (Normally Closed). Tools needed: socket set Dremel tool or fine cutting tool Instructions: Step One: Remove cover of drivers side kick panel by unscrewing single torx screw. Chris, Pin #86 is for the 12 volt positive lead, and pin #85 is for ground. An electro-magnet (also called a coil) is used to pull a set of contacts, or pins, together. The relay ground in both cases goes to the chassis. So here is the pin configuration. High Wattage Headlights Wiring Diagram: This diagram is fo using high-wattage bulbs with stock headlights. Make sure the band on the diode on the ignition wire (which prevents power from going back through the system when the ignition switch is turned off) is facing the relay. typically I Use 30amp Fuse for Electric Radiator Fan, Electric Fuel Pump, Headlights BUT how about for the Electric Seat? The SPST relay is often found in the wiring harnesses for aftermarket lighting; it has a common contact and two Normally Open contacts that are internally connect. Does it matter how many amps the switch is rated for if I use a relay? Lamp Aiming. Does it make a difference if the switch activating the relay provides a ground or power? So I bought a relay with a built in fuse. You can read our earlier post on How Relays Work for a more detail description of how relays operate. Pin #86 is for the 12 volt positive lead, and pin #85 is for ground. Locate the high beam relay for the headlights. Of course fog lights are a useful extra tool when visibility is poor, but they won't make you invincible. You can use a thermostat housing that allows the thermo switch to be mounted after the thermostat. Installing new fog lights on your vehicle can greatly improve your visibility in poor weather conditions. For driving or roof lights: connect the positive lead to the high beam positive wire, and the relay ground to the chassis. All the switch does is activate the relay and you won't have 20 feet of 14 gauge wire carrying the full load. When you create a circuit (a loop of electricity from the battery to your LED Light bar), if you just put a switch between the battery and the light, it will have to be rated for the full current (amp draw) of the light. You are right the combination meter fog light icon is illuminated by the relay. connect the ground wire from the relay to the high beam positive wire so the fog lights will turn off when the highs are on. If your car was manufactured pre-1980 you may need to heed this warning. We and our partners will store and/or access information on your device through the use of cookies and similar technologies, to display personalised ads and content, for ad and content measurement, audience insights and product development. Alternative Fog Or Driving Light Schematic. While proper wiring for fog lights is not just adding … Why not just use an ordinary on/off switch, you ask? I want to connect my digital radio APX6500 to klaxon and strobe light to be active when the radio receives an emergency call Can use a machine that does not use relay to make it use. Pingback: Engine Compartment Fan Manual Switch - 986 Forum - for Porsche Boxster Owners and Others. A relay is an electro-mechanical switch. Its a V8 L.A. 318 Chrysler motor with 3 speed auto transmission. Electric Fan Wiring Diagram: When wiring an electric fan, make sure the positive ignition lead is one that turns off when the starter is engaged. Make sure the ground wires for the new bulbs is at least 14-gauge. So my wiring would go like this. If you have power to the relay but no power at the lamp the relay is bad. This is why we offer an HID Relay Harness. I have a perhaps dumb question. Would that stop my relay from not working? Regardless of what you choose, it’s of utmost importance that your wire gauge (AND relay rating and fuse value) is appropriate for the run length and amp draw. Loosen the stud or bolts securing the fog or driving lamp to the bracket to adjust the lights up or down. I’ve been able to get the wires from the wiper unit to work(Hi/Lo speed) along with the H2O pump to emit water onto the windscreen. The switch ties into the relay and opens/closes the circuit as necessary. You can remove the cover and check the fuse.) L-LO, H-HI, W-WASHER, B X2- BATTERY & P-PARK. Electric Water Pump With Cool-Down Timer: A cool-down timer allows the water pump to continue circulating after the engine has been shut off to dissipate damaging engine heat. If you move the battery to the rear of the vehicle, locate the relay/fuse bank near the battery and run 20-18 gauge wire to the cockpit to trigger the relays. 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