Door jamb switch

[Bonearzt]

Hi All! I've been a lurker for a while and have picked up a LOT of incredible info from you All, so THANK YOU!!

Had a weird situation pop up earlier today.
I'm replacing old wire for the dome light, 2 wire, no common ground, easy right?
But!
When I test the circuit , I get 0.32v with the jamb switch engaged, door open, under dash light on.
But when I depress the switch, dash light goes out and I get 12.96v in the dome light circuit!
Headlight dimmer switch has no effect, but itself might be faulty.....being old...
Thoughts?

Thanks!!

Eric

 

[Blue Ox]

Check the fuse for the lighter socket. For whatever reason, if that fuse blows the dome light gets energized.

 

[Bonearzt]

Interesting!

Thank you!