Installed a set of tow mirrors on my 2007 and everything works with exception to heat! Just installed a temp module with defrost and the light just flicks when depressed and doesn’t stay on! It’s pretty warm outside but at first it felt as if I could feel heat on mirror with back of my hand! Now cold again, do they temp out and not come on again until temp down? Have the 40 amp heat fuse installed but the 10 amp indicator fuse doesn’t seem to have a socket for contacts in fuse box!
Thanks

 

Have you taken any volt reading at the switch or at the mirror connectors on the heat wires?

 

I just figured out my truck doesn’t have the rear defrost relay in it and the fuse box doesn’t have the female sockets to accept the relay! Can’t work without it! Thanks for the reply

 

Guess I wasn’t feeling heat! Was just the sun