Quote Originally Posted by 36 sedan View Post
Ken, you are correct it can be done with a single relay switching the ground. I may have misread his post thinking he wanted to switch positive via a negative input, thus the second relay.
Thank you

I printed your diagram out a couple of times trying to figure out how it worked and it just dawned on me that only one relay was needed, at least the way I understood it. Glad to help and FWIW, the only "latching" relays I've seen were on DC-10s and they were big and used in the generator power system.
I wish there were more questions of this nature as it helps me keep my brain active