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Discussion Starter #1
Hello there fellow Dieseler friends!! I have a problem with my Truck of course.

The brake light don't come on when I push the brakes, exept the cargo light one on top of off the trunk. I tough it was the light so I changed all the bulbs, nothing changed. What makes it intersting is when My night light are on, the light are on, they just don't dim when I push on the brake pedal. My signal light are not working either (checked the bulds).

I think I may have a Electrical problem....... I hope I don't but it must be because I when I checked it yesterday, I 've did everything I could (just checked the fuses and blubs) and still didn't work. I went inside of glass of water, came back out and My brake light and signal light were working all of a sudden without doing anything. I left the truck running(didn't touched nothing) and went inside for a shower, came back out, not working again????????????

Second problem, My while I was driving it for a test drive, My tranny was stuck in second gear and didn't wanna shift at all, at the same time My engine light came on. I stoped and shut down the truck, started the truck, problem gone!....????

Those one problem are really weird. can it be electrical related to? My tranny do not slip and feels really smooth I think my tranny is in good condition.

Does some one had any idea where else to check for that?? is there some special connection for brake light and signal light?????

I don't wanna bring it to the Garare because I don't have that kind of money. And U know how much they charge for electrical problem!! some insane amount.

Any help will be VERY appreciated, and sorry for the grammar and structure.
 

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try cleaning up the positive connection on the passenger side battery. bad connections can do that it did it to my truck. weird enuf.
 

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You don't list what year your truck is but the '95 & up had problems with the ignition switches, that is prob what the tranny issue is caused from.The PCM is looking for 12 volts at start up and if it does'nt see 12 volts it puts the trans in limp mode, which is second gear only. The brake light switch could be the problem with you brake lights, if you have a test light see if you have voltage out of the brake light switch with the pedal depressed. Hope this helps and keep posting your progress.
 

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its probably your multifunction switch(turn signal switch). Mid to late 90's Blazers had a recall for the same issue. We had to replace just the hazard switch itself. Try turning your hazards on a couple of times with your foot on the brake and have someone watch to see if anything changes. only on 95 and up with the "new style" dash. hope this helps.
 

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Discussion Starter #5
Thank you really helpful. I Will try all the above.

By the way my truck is a 1997 GMC 1500 6.5L (those special reinforce Canadian half ton)

I hope those work. But sound like it's my problem

My traile brake was installed in a very Hillbilly Fashion way(Sorry of expression, from previous owner). this may be a problem to because when I hook up a trailer, my signal light works but not the electric brake.
 

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Discussion Starter #6
And I forgot to say that MY front signal light works. It's just the rear one that do not work.
 

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I had a similar problem with my brake lights.....after a lot of work it ended up being a wire wore thru / split right at the base of the steering column. The wire from the turn signal switch wore where it moved from tilting the steering column. Cut and spliced and it's been good since.
 

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Allow me to interject...I blew a BIG 30 amp fuse in the engine block....somehow. While offroading coming back from a fishing trip. The police were happy to point out my third brake light worked but the 2 lamps did not. I swapped bulbs AND swapped out the brake switch...nothing! The switch is a very common problem might I add. Turned out to be a fuse under the hood that controlled the lamps in the rear.
 

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The most common problem is the POS circuit board in the taillamps that corrodes where you can't see. Turn on your four ways with the taillamp disassembled and gently twist the board and the plug. If they come on replace the board (most auto parts stores carry them.) Left and right are different p/n's.

If your 4ways work in the back, replace the stoplight fuse and forget bthe above test.
 

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Discussion Starter #10
heymccall;1563574; said:
The most common problem is the POS circuit board in the taillamps that corrodes where you can't see. Turn on your four ways with the taillamp disassembled and gently twist the board and the plug. If they come on replace the board (most auto parts stores carry them.) Left and right are different p/n's.

If your 4ways work in the back, replace the stoplight fuse and forget bthe above test.
The POS ?? What is it? Are you talking about the light Connector plate, it's like a black plastic that the light hook into it. I changed those last summer. They were all corroded.
 

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Discussion Starter #11
billyjackk2500;1563510; said:
Allow me to interject...I blew a BIG 30 amp fuse in the engine block....somehow. While offroading coming back from a fishing trip. The police were happy to point out my third brake light worked but the 2 lamps did not. I swapped bulbs AND swapped out the brake switch...nothing! The switch is a very common problem might I add. Turned out to be a fuse under the hood that controlled the lamps in the rear.
That would make sense, the fuse in the hood. I guess it controls the signal light in the back too if it's the same light and system
 

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wongpong;1564714; said:
The POS ?? What is it? Are you talking about the light Connector plate, it's like a black plastic that the light hook into it. I changed those last summer. They were all corroded.
POS = piece of ****.

I've had several trucks fail the boards in less than 6 mos. The GROTE (brandname) ones last longer and so do the dealer ones.
 
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