Circut boards good bulbs good cant find any broke wires
Check your Tailight fuse to see if it's blown, if so then start checking for a bad bulb(shorted element) in tailight circuit boards . and also don't forget to check grounds as well, there should be one at rear frame by left (drivers Side) tailight connection/trailer harness connection. hope this helps. do your Brake lights Work ?
SOURCE: rear parking lights dont work 2001 GMC sierra
It would then be a bad ground. Start at the bulb fixtures cleaning and refastening; look for cracked broken wires as you go. A little multimeter will help.
SOURCE: can not get my tail lights to work onk 1989 gmc truc
The front park lights work correct? If the front park lights work than there is not a problem with the light switch since the brown wire from the switch supplies power to the front park lights, front side markers, and the rear taillights. There should be twelve volts on the brown wire from the headlight switch with the connector plugged in and the park lights turned on. If this is true that there is a problem with the wiring to the back of the vehicle. A thorough inspection of the harness should reveal the problem.
The dim break and blinkers support the above. High resistance also know as corrosion, in the wires or connections would cause this problem.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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