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      10-13-2015, 08:29 PM   #1
135iRick
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How do you put exterior lights in and integrate them to the headlight controls?

Hey everyone. I was considering doing some fiber optic or LED lights in my front bumper at the intake for the brake cooling ducts. I would like them to switch on with the headlights or parking lights. I have adaptive xenon headlights. Is there anything I need to know about how things are connected to the computer and the headlights or can I just tap off the +12 and negative? Anywhere I can find a wiring diagram?
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      10-14-2015, 08:15 PM   #2
spain4065
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Interested as well...put on fogs and want to control them with oem switch as opposes to external switch.
Bump.
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      10-14-2015, 09:50 PM   #3
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It's not that difficult, just tap into the circuit you want the lights controlled with - i.e. Park lights, headlights.

You could do it one of two ways;

1. Parallel circuit using the power and ground supply directly off the headlight harness.

2. Use a relay tapped into the headlight harness to control the light. Relays are basically devices which allow a low current circuit to control a high current one. It effectively isolates the two via an electromagnet powered switch. Your LEDs would then be run directly off the battery, either a constant 12v or an ignition or accessory 12v circuit. You could tap these at the fuse box.

Personally I would opt for a relay as the electromagnet requires a very small load and this way you shouldn't get any computer related errors showing up.
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      10-19-2015, 04:33 PM   #4
135iRick
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Ok cool. I didn't know how angry the computer would get if I decided to do that. Anyone have a wiring diagram for the headlights or know where to find one?
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