turn signals/brake lights woes

[willyp]

Having trouble with turn signals/brake lights. I installed a new painless wiring harness part # 10112 and new tail lamp pigtail and rubber boot harness from classic parts part # 55-152 about 6 months ago. During the day without the running/headlights on the rear turn signals and brake lights work fine without any issues. At night with the running/headlights on the rear running lights work fine but when I step on the brakes the running/brake lights on the driver side go out.

Seems this would be an easy thing to trouble shoot………….wrong!

It is an intermittent problem, all lights work fine for a couple weeks so I am 100% sure everything is hooked up properly, then back to the original fault. To make it worse the problem started on the passenger side lights and now they work fine and the driver side lights now have the fault. Last night the fault reoccurred, when I got home I parked the truck in the driveway without shutting the ignition off, removed the tail light lens and bulb and checked for voltages…………checked out good in all modes. I reinstalled the bulb/lens and drove around for 45 minutes with no issues.

1. I have checked all voltages for tail lights and brake lights/turn signals. All +12 volts when commanded. (running, turning (pulse) 4 way flashers and brake)

2. Installed separate ground straps for each tail light housing to the truck bed, and a new ground strap from the bed to the frame. All grounds locations have been ground down to bare metal and new soldered connectors, sheet metal screws and slight dab of dielectric grease to prevent dirt, moisture and corrosion.

3. Replaced both rear bulbs #1157.

4. Inspected all wires from the fuse box to the tail section for any chaffing or damage, opened up every splice to ensure there are no brakes. No crimp type connectors were used on the truck only solder and heat shrink tubing. If a crimp connector end was used then I also soldered the connector to the wire. Chaff tape and zip ties used to prevent chaffed wires or vibrations.

5. Replaced tail lamp lens gaskets for possible moisture/water .

6. The front running/turn signals work fine with no issues.

This forum is has a huge knowledge base so hopefully someone has been down this road before and can give me some insight to any other solutions.