Originally Posted by Idle

I may be confusing these with 111 bulb holders but I think the biggest problem is they lose their ground connection. Just use an ohmmeter to find the ground pin, and, if you can't find one, there's your trouble.

I just twist a wire around the ground pin and drill a hole in the ground strip or the metal body. Then attache the ground wire with a screw. This gets the ground to all the bulb holders. Also check to see if you are getting a ground through the plug. The connection to the body may need to be cleaned.