Electrical Gremlin

Clean all your ground contact points yet?

FIRST thing on ANY Pantera electrical gremlin -
clean the grounds.

Each tail light has its own ground point. You will need to remove them from their buckets to access it

Next, for light bulbs, switch for a known good bulb.

Next, check plug contacts for tightness and corrosion.

Larry

The red wire is for the brake lights. The yellow and yellow/black wires are for the tail lights, front parking lights, side marker lights, and license plate lights. These are on fuses #3 and #4, and are split right side lights and left side lights. Even the license plate lights are split between these two circuits.

Wiring diagram indicates that the yellow wire and fuse #4 is for the left side of the vehicle.

If the left side marker light and the license plate lights work, then check the light bulb, bulb socket, ground connections, and wiring harness connector as Larry suggested.

John

Is your backup light working? On mine the left tail and backup works on the same "+".

After spending a couple of hours I decided to call it a day. After putting everything back together the left tail light came on. Maybe a ground connection or?
Jeff