Electrical help! 03 mustang headlights

Itsjustapigron

New Member
Dec 14, 2018
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18
Louisiana
So I just installed the “white face reverse glow gauges” and my turn signals work but my headlights (low and high beams) don’t work. Also, I can use the “flash to pass” and my lights come on.. don’t know what to do
 
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wmburns

SN Certified Technician
Aug 14, 2009
5,507
451
164
Houston Texas
I give up. What model year Mustang are we dealing with here?

IF we assume this is a 1999-2004 model year, then double check fuses F1.2, F2.38, F2.10, F2.4.

1999-2004 MY fuse panel schedule:
https://www.allfordmustangs.com/forums/4-6l-tech/305933-1999-mustang-gt-2001-motor-swap-wont-fire-please-help.html#post2669271

Next we have to confirm power out of the the head light switch RD/YE wire with the head lights on. Note, there is a circuit breaker inside the head light switch. Plus the head lights switch does fail after many years of service. Look for evidence of over heating.

Next check the electrical connector to the multi-function switch to be sure it's fully seated.

What to do next depends upon the test results.
 
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