Gauge Wiring Question - Ford Mustang Forum
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post #1 of 2 (permalink) Old 07-02-2010 Thread Starter
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StangBoy04's Avatar
Joined: Oct 2007
Location: Elk Grove
Posts: 30
Gauge Wiring Question

I just install an autometer electric nitrous gauge and it now only works when I turn my lights on. I used a fuse tap and tapped fuse 37 for a keyed 12v source, black to ground, and the white wire I ran to the headlight switch harness and I tapped the main big gray wire. It works great when my lights are on but when I turn them off I get nothing... I figured I could just connect the white wire to the keyed 12v source too but I dont want the gauge to be lit up all the time. How can I wire so that the gauge always works when the car is on but the lights will only go on when I turn the headlights on? Thanks!

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post #2 of 2 (permalink) Old 07-04-2010
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Joined: May 2008
Location: Charleston AFB
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from what i interpret from this diagram, fuse 37 is only hot when in park or when the headlights are on, hence your problem... pick a different ignition-hot wire

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