Marker lights out

[cskemps]

Ok last niight went out to hook up the harse trailer and i had no marker lights on the truck or the trailer. have checked all the fuses and they are all fine. I still have brake lights and signal lights. is there anything else i have over looked?

 

[GM Guy]

headlight switch needing replaced?

 

[DEERE3594]

headlight switch needing replaced?

thats is where I would start, I went threw have a dozen in my 94. Never had a problem with my wifes truck (the new style switch like your 97) but still possible.

 

[cskemps]

Ok i will try that tommorow. thanks

 

[gulfyankee]

brake and turn signals are on the same circuit. take a meter and check the plug back by the bumper with the running lights on. you should get 12v. do you have dash lights?

 

[cskemps]

yes i still have dash lights

 

[cskemps]

Ok changed headlight switch still no marker lights. Still have signal lights and brake lights come on when i press the pedal. Any other ideas? I don't have a meter but i have a circut tester and i get power to the back plug but only on the constant hot and on the turn spades when the signal's are on and when the brake is pressed down.

 

[GM Guy]

is there a maxi-fuse in the underhood center that does anything for marker lights? i thought there was a 30 or 40 amp one, doubt this is it, but try changing it (if there is one) with trailer uncoupled, then if it works, plug in the trailer, and if it blows, there is a short somewhere.

if the fuse doesnt pan out, how are all your flasher modules

 

[Tookie]

Do the marker lights on the truck work when the trailer
is not plugged in? If so, not the fuse, it's in the trailer wiring.

 

[cskemps]

nope the marker lights don't work atall with or with out the trailer.

 

[corolla]

Bad ground?

 

[gulfyankee]

have you looked at the plug under the hood by the firewall? there should be a flat 5 lead plug coming out of the cab under the master cylinder. check the voltages there.

 

[cskemps]

Ok got it fixed it was a broken ground. thanks for all the help.

 

[corolla]

Good to hear you got it!

Where was the break?
At the rear under the bumper?