The passenger side taillight works great. Everything works on the driver's side except the night time running lights. (turn signal, brakes and reverse are all fine)

 

I'm using an 1157 dual element bulb, one element is for brakes, the 2nd for night time running. I've tried several bulbs but nothing works. (now i just have a large collection from different cars and some new as well)

 

I tested the current and it seems it is getting about 8 volts to the bulb when the car is not running. I sanded the contacts and cleaned all the connectors. I even lubed the connector plate to be sure it wasn't sticking. I am getting current to the connector.

 

No matter what I do I can't get the night time lights to work. Is my voltage low? Wrong bulb? any one else have this issue?

Check your fuses

You have a bad conection to power going to the left rear running light. You are going to have to trace the wire back from the light and find the bad connection. It could due to a damaged wire or bad termial connection.

Pull the rear side panel on the passenger side of the bed and check the connector inside there. I have had a few issues with corroded terminals there on a few of my BRATs.