1931 - cowl lights - no tail light
 

New wiring harness--- 6 volt - non signal light-



tail lights on with low beam and high beam



No tail lights with cowl lights



Should tail lights be on with cowl lights ?
Possible reasons no tail lights with cowl lights.
Thanks

Re: 1931 - cowl lights - no tail light
 

The original switch plate had the wires soldered to it.
Some of the reproduction ones have connecters that just push on —- perhaps that wire fell off.

Re: 1931 - cowl lights - no tail light
 

I am not sure if this is the problem, but the original switch plates were phenolic that did not get soft when heated. The reproductions are a thermal setting plastic that can get soft and even melt. If there is some resistance and a large amount of current the contacts will get hot and get pushed away from the switch arm. Try to locate an original switch plate and then just solder the new wires to it.

There are two version of the switch plate, early and later. Make sure you have the right one for your car.

Re: 1931 - cowl lights - no tail light
 

Grease and oil are not good conductors of electricity, clean the switch body internally, the contacts need to be clean a bright !