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Old 09-23-2014, 05:22 PM   #4
Sergio
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Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
Default Re: Wiring Relay to Key Switch for Accesories

The +12v should come off the Blue wire on the 12pin connector behind the dash.

Just trace the wires from the headlight back to the dash and You should find it.

The Negative for the headlight comes off the same 12 pin connector.

I am attaching a higher quality wiring diagram for the 2007 precedent IQ.

If You have tail lights, brake lights, etc... You may be better off attaching your 12v AUX battery negative to same negative (Pack Negative) as Your lights are currently connected.

It will make no difference electrically, and will allow you to use the existing harness.

That Blue wire that comes from the Battery pack can power more than just the headlights, it actually goes into the harness for tail lights, horn, etc...

You definitely need to disconnect that existing Blue wire from the pack and run that to your fuse block or relay.
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File Type: jpg 2007_Precedent_IQ_Wiring.jpg (520.7 KB, 0 views)
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