Driver side rear turn signals and brake lights not turning on 1988 Comanche 4.0

[Comanche man Don]

Ok fellas , I’m getting all my lights working with new sockets and bulbs. All of my lights are working except the rear drivers side brake lights and turn singnals. They will light up with my running lights on with one filament but the other filament used for brakes and signals I got nothing. I’m pretty sure the new sockets are wired correctly as the marker light filament is the correct one to be lighting up and the install is pretty simple. I checked and redid the ground behind the driver side tail light and inspected and cleaned two grounds mounted together near my air box and fuel ballast resistor. I’ve used bulbs I knew where good to rule out a bulb issue. Maybe my brake light switch on my pedal is bad?? I’m not sure what’s going on but any advice is greatly appreciated. Thanks 

[jdog]

With a test light check the socket for power with the pedal depressed. You either have a bad wire to that side or a bad turn signal switch

[Pete M]

there's a harness connector right behind the drives rear tire that is known for corrosion issues.  if one side doesn't light up for brakes orf turns or hazards, then I would check for power at that connector.  

[Comanche man Don]

So after some test lighting I found a spot near that harness you mention that had a bad connection where some trailer wires were hacked in. I re wired it and they’re working great. Thanks for the tips

[Pete M]