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post #1 of 21 Old 01-31-2013, 06:46 AM Thread Starter
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Headlights = kill switch

A while ago, one of the first cold mornings. Truck has idled for maybe 10 minutes. I hop in put it in rev. Hit the headlights and the truck shut off. I didn't think much about it.

This morning driving to work. Rigs been running for about 30 min. I pull thru the gate. Dim my lights. Pull thru lights back on, truck shuts off. I coast to a side road. Cycle the key and she fires right up.

I know your lights are on a constant hot, your ignition has a constant hot. But other than that I'm not sure why one would cause the other to shut off. Any thoughts?

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post #2 of 21 Old 01-31-2013, 09:14 AM
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Did you happen to notice, when it happened while you were moving, did the speedometer drop to zero?
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post #3 of 21 Old 01-31-2013, 09:16 AM Thread Starter
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Re: Headlights = kill switch

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Originally Posted by madpogue View Post
Did you happen to notice, when it happened while you were moving, did the speedometer drop to zero?
Not a 100% but i think the dash lights/power went dark

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post #4 of 21 Old 02-01-2013, 03:13 PM
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I had the same thing happen to me when I started my truck on a cold night when I was leavin work, the battery gauge was really low and I turned my h/l's on and the hids suck a lot of power, I guess from that and the gpr being on it killed the truck which I thought was weird, because I just put two new motorcraft 850cca batts in it but it fired back up with no problem. Another time, again it was cold and I was leavin work, I started the truck and flipped my lights on after about 5 seconds and the truck shattered like it almost died, the cel came on, and the "off" on the shifter was flashing, I put my foot to the gas pedal and nothing, the truck didn't rev up so I restarted it and everything was fine, it never done either of the two symptoms again and I guess it was just the cold weather and me being hard on the batteries

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post #5 of 21 Old 02-02-2013, 12:15 AM
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I have the same sort of issue, except that it doesn't die outright, but when cold the idle will bump up and down as if the GPR was cycling off - which it isn't - and continue to do so for a few minutes until the GPR has finally switched OFF.
Lights go bright and dim with the idle speed, and trying to give it any pedal seems to make the problem more severe.
Hope someone has an idea what might be causing these problems.

I replaced the GPR back in November, so I don't think it is the issue.

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post #6 of 21 Old 02-02-2013, 01:58 AM
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Headlights = kill switch

Do you have a dp tuner?



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post #7 of 21 Old 02-02-2013, 06:54 AM
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post #8 of 21 Old 02-02-2013, 06:57 AM
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Sounds like something is grounding out from inside the headlight switch and killing the power to the ecm....could find another headlight switch and swap it and see if it happens again.

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post #9 of 21 Old 02-02-2013, 07:00 AM Thread Starter
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Re: Headlights = kill switch

No do tuner. Truck is stock to the best of my knowledge. It's got an aftermarket radio and tow brake controller.

Ive got a new set of batteries and new GPR. The first time i figured it might be just an overload on the system being that it had pretty much just been started and a cold day. But the last time i had been driving for 30 min. If it keeps happening I'm gonna tear the dash apart. So far it's happened in places that were pretty safe areas. I'd hate to be towing a load down a busy highway hit my lights and loose all power and kill the motor

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post #10 of 21 Old 02-02-2013, 08:11 AM
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Does it happen when you pull the switch to the parking light position?
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