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OEM fog light instructions or wiring schematic


ahardb0dy
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No schematic, but if I'm remembering right... there's a black relay by the passenger's side hood hinge. A signal wire runs from that into the cab to the fog lamp switch on the console, and from there to one of the low beam wires in the steering column. The fog lights plug into a harness with a constant ground and + going to the relay. (IIRC each fog light's + feed went all the way to the relay without teeing into one wire, but don't quote me on that.) When the relay closes, it connects that line to battery + through an in-line blade fuse holder. I don't remember exactly where signal ground went, if it tapped into something else or had a ring connector or what, should be easy enough to figure out though.

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I wasn't sure ( I'm looking into this for someone else), if they ran the relay trigger wire to the low beams or if the power to the switch ran from the low beam? That's why I was looking for a schematic.

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so the power from the low beams runs to the switch than out to trigger the relay? So run switched power to the switch and the lights will come on when ever you want.

 

Thanks

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It's actually much simpler than that.

 

The fog light relay has 5 connections, labeled like this:

 

30. This is the power circuit input from the low beams
85. This is your ground
86. This is the relay control circuit input from the switch.
87. There are two of these, which are the power circuit output to the fog lights

Move the connection on the relay labeled "30" to a switched source, you can run the fogs independent of the headlights. No other changes are needed.

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It's actually much simpler than that.

 

The fog light relay has 5 connections, labeled like this:

 

30. This is the power circuit input from the low beams

85. This is your ground

86. This is the relay control circuit input from the switch.

87. There are two of these, which are the power circuit output to the fog lights

 

Move the connection on the relay labeled "30" to a switched source, you can run the fogs independent of the headlights. No other changes are needed.

Actually I thought the '30' was meant to be a red wire with an inline fuse going to the + on battery. That's how I have my relay connected for my led bar and it's independent from the normal headlight switch so I have full control over when I need to use it.
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I guess I should have been a bit clearer.

 

"30" is the power source for the switched circuit of the relay. It can be direct from the battery if you want to the circuit work all the time (like you have it). When I said to connect "30" to a switched source, I meant connect it to a source that's only hot when the ignition is on. That's the setup I thought ahardb0dy was looking for (and how I've got mine wired).

 

In either case, you're right that there should be a fuse on the wire connected to "30".

 

The connection to "86" is to the switch to control the circuit (in this case, the foglight switch), not the ignition switch. When "86" get's power, it energizes the electromagnet inside the relay to complete the circuit between "30" and "87" - which then sends the power to whatever you want to control.

Edited by xterra
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