Headlights always on - Diesel Forum - TheDieselStop.com
1999-2007 General Questions General questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

 
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post #1 of 4 (permalink) Old 06-15-2017, 01:42 PM Thread Starter
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Headlights always on

I'm just finishing up swapping my 05 6.0 into an 06 crew cab. crew cab was gas, but I swapped every wiring harness. Everything seems to work so far, just one issue i can't seem to resolve. Whenever the batteries are hooked up, the headlights stay on, and the high beam indicator is on. Doesn't matter if the key is on or off, truck running or not. I've tried unplugging the headlight switch, and three fuses for the headlights, but nothing seems to kill them. Ive been back over the harness a bunch, and nothing is pinched or chaffing. Lights worked fine before the swap. Any ideas? Thanks
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post #2 of 4 (permalink) Old 06-19-2017, 11:51 AM Thread Starter
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After messing with it a bit this weekend, i am still stumped. The only way i can get the lights to go out is by pulling the 30 amp flash to pass fuse.
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post #3 of 4 (permalink) Old 06-19-2017, 04:08 PM
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I believe the flash to pass circuit goes directly to the multi-function switch, which then sends power to the headlights, whether it comes from the headlight switch or the flash to pass circuit. So my guess would be that your multi-function switch is mal-functioning instead of multi-functioning.
I would check there for a solution. Might be just a coincidence in timing with your engine swap.

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post #4 of 4 (permalink) Old 06-20-2017, 09:31 AM Thread Starter
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Thanks. Is there a procedure to test this? Anything can happen, but I hate to just throw parts at it whereas it was previously working fine.
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