No Turn Signals or Brake Lights - Dodge Cummins Diesel Forum
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post #1 of 14 (permalink) Old 03-20-2010, 02:38 AM Thread Starter
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No Turn Signals or Brake Lights

So I tried to plug in a trailer and my turn signals and brake lights in the truck stopped working. If I push in the hazards light then I have brake lights and turn signals. Any Ideas?


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post #2 of 14 (permalink) Old 03-20-2010, 02:41 AM
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u check you fuse?

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post #3 of 14 (permalink) Old 03-20-2010, 10:08 AM
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hook up a ground between the truck and the trl and see what happens, (use a set of booster cables for testing purposes)

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post #4 of 14 (permalink) Old 03-20-2010, 11:37 AM
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do your turn signals still work on the truck if the trailer is unhooked, it might be in the truck and or trailer plug, and do you get any lights on the trailer when it is plugged in

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post #5 of 14 (permalink) Old 03-20-2010, 11:46 AM
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do you have dash lights? check your towing fuse under the hood, also look at the tail lamp fuses

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post #6 of 14 (permalink) Old 03-20-2010, 03:33 PM Thread Starter
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I still have dash lights I just don't have brake lights or turn signals even with the trailer unplugged unless I push in on the hazard button.

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post #7 of 14 (permalink) Old 03-20-2010, 03:35 PM
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Does your third brake light work?

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post #8 of 14 (permalink) Old 03-20-2010, 09:27 PM
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i got were you are coming from, there is a fuse i cant remember if its under the dash or under the hood but i would put good money that it is blown i had this happen to me on a few other trucks

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post #9 of 14 (permalink) Old 03-20-2010, 10:04 PM
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Quote:
Originally Posted by carson b View Post
do your turn signals still work on the truck if the trailer is unhooked, it might be in the truck and or trailer plug, and do you get any lights on the trailer when it is plugged in
Quote:
Originally Posted by carson b View Post
i got were you are coming from, there is a fuse i cant remember if its under the dash or under the hood but i would put good money that it is blown i had this happen to me on a few other trucks
x2 hooked a trailer up one time that blew several fuses from under the hood.

I recommend gathering spare fuses for under the hood, i couldnt find them at walmart at 1am.

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post #10 of 14 (permalink) Old 05-16-2010, 06:33 PM
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On my 1997 there is a separate flasher for the turn signals and emergency flashing lights. The two flashers are both located next to the fuse bank inside the truck which for my year is on the drivers side of the dash. I'll bet you blew one of the flashers.
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post #11 of 14 (permalink) Old 05-16-2010, 10:58 PM
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Ok, this MAY be your problem ,it sounds all too familiar.

Your Hazard switch goes into your turn signal switch assembly. All of your signals and Brake lights actually go in there too. How else does one of the lights be bright with the brakes on, and the other flashes from the signal being on... !!?? haha

If the fuses are good, just go order a Turn signal switch. Your describing the symptom to a T for the turn signal switch crapping out.

If you play with your hazard switch enough, you may get the contacts to renew and they may work again until you touch or jolt the hazard switch again Dust and grime and whatever just settles in there, stuff gets grimy, the contacts get bad, and you go to push the switch in and BAM, game over.

BTW, I know the issue cause I have replaced dozens in various vehicles. GM trucks are good for the Same problem.

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post #12 of 14 (permalink) Old 05-16-2010, 11:44 PM
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You are right, that could very well be the problem. I had that happen on a 1989 Honda Accord, only when the hazard switch went it took the turn switch with it so I HAD to replace the assembly to get my blinkers back.
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