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Old 08-28-2012, 07:52 PM
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foglight wiring

I just installed a rebelwire 9+3 wiring kit in my project truck. I will be adding auxiliary foglights and my question is this: Can I just bring power in off one of my headlight switch leads through a toggle switch straight to the lights (with a fuse in line)? Would I even need to worry about a relay? Would the headlight switch lead be tied into the relay on the harness itself? There is only one relay on my harness fuse block. Does everything run through that single relay? I'm pretty new to installing harnesses. Any help is appreciated. Thanks.

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Old 08-28-2012, 08:30 PM
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Use a relay

Use a second relay to power your foglights. You can trigger the relay from your headlight switch, but use an independent power source for the lights themselves.
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Old 08-28-2012, 08:48 PM
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This is how I'd wire it
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Old 08-28-2012, 08:56 PM
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This is how I'd wire it
Looks good. I should be able to bring both power leads in from my headlight switch then. I'm using a Ron Francis and have a 12g powerfeed for my fused 12v and then I'll use the taillight feed off of the same switch for my trigger. That way the fogs will go off when I turn my lightswitch off regaurdless of if I remember to flip the toggle.

Does this sound acceptable?
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Old 08-28-2012, 09:17 PM
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Here's another helpful diagram I found.


Last edited by RatPin; 08-28-2012 at 09:27 PM.
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Old 08-28-2012, 09:43 PM
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There is a section on wiring fog lights in the Bosch relay application guide, linked to on the Crankshaft Coalition wiki article here, page 29.

Don't know where your question went but 85 or 86 can be grounded, depending on the circuit. In the Bosch application guide, the diagram shows 85 being used as the ground for example.
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Old 08-28-2012, 11:37 PM
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Originally Posted by cobalt327 View Post
There is a section on wiring fog lights in the Bosch relay application guide, linked to on the Crankshaft Coalition wiki article here, page 29.

Don't know where your question went but 85 or 86 can be grounded, depending on the circuit. In the Bosch application guide, the diagram shows 85 being used as the ground for example.
That is a great link. Thanks! Relays are really amazing things.
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Old 08-29-2012, 03:54 AM
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Sounds like you have it figured out, I like the headlight feed to the relay coil...... like you stated, in case you forget to flip the toggle......lol
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