I have join the two wire and it is working. Thanks but I don’t understand how It could work before without it . Can I work for a while without damaging anythingMore likely it fell off.
The fuse color in the Messicks one I posted earlier was red which I believe stands for 50 amps.
Go to places like NAPA and try and find one. Do not bypass the fuse as it is a great way to start a fire.
To prove to yourself my diagnosis is correct momentarily connect the two terminals together and see if things start working.
Just briefly.......
Dave