Big electrical problem

I have a 95 GMG 2500 My problem is that I have no running lights, no taillights and no dash lights until I press the brake pedal, and it dosen't matter wheather I have the headlight light switch on or off.

Any help would be appreciated. Thanks in advance.
Brian
 

augerandblade

PlowSite.com Addict
First thing I would do is check for proper ground by running a cable from the negative side of the battery right to the ground wire on the lights. Check for proper ground to your firewall.
 

2COR517

PlowSite Fanatic
Do you have a trailer plug/harness? I just fixed a suburban that the running lights would not shut off. She backed into a snowbank and two tabs were pushed together. I would disconnect the entire rear lighting harness under the tailgate to start, and your electric brake controller.
 

damian

Senior Member
Location
avon mass
check for a rear tail lamp bulb filament bridged to the brake lamp filament,this would make the park lamps/dash lamps come on with the brake lamps,then replace the park lamp fuse,let me know how you did,good luck.
 

damian

Senior Member
Location
avon mass
also forgot to mention,the tail lamp units on your truck have been troublesome,the have plug in boards that have had corrosion-short-open problems if you find those to be the problem,aftermarket replacements are cheep,just replace both tail lamp units.good luck.
 
OP
B&E snowplowing

B&E snowplowing

Senior Member
Thanks for all the help...Once I removed the trailer lights wiring harnes everything started to work fine again. The wiring harness look ok, but I decided to remove it, because the fuses were good and the grounds and bulbs all seemed ok. Once again thanks a bunch
Brian
 

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