Rear Running Light Not Working (80 Liquifire)

[Hackinator]

The rear running light on my 1980 JD Liquifire does not work. Headlight on Low and High and also the brake light works, but not the rear running light. I checked the filaments and even swapped the bulb. Still no running light. Has anyone encountered this before, and if so what have you done to fix it? Thanks in advance.

[AirborneX4Special]

Sounds like a bad light fixture. I have had a similar issue with a good tail light but no brake light. Replaced the entire fixture and both worked with the original bulb.

[JDT]

As Pat mentioned those sockets can go bad.
Use a test light or a volt meter with the engine at idle.
Remember that you are looking for 9-12 AC volts, not DC.

Another place to find a problem is in the wires that run under the seat.

I have found a few where the wood has rubbed through one of the wires.

And mice snacking under the dash/consel may have severed the wire for the tail light.