Battery test button

[dmksails]

My power panel has a battery test button. I’ve tried it, but it doesn’t seem to work. I’ve no documentation on this and before I open the panel I would like to know how this is suppose to work and how it would be wired. Any ideas?

[CharlieJ]

A B+ conductor is routed to one of the SPDT load terminals, a B+ conductor is routed to the other load terminals on the SPDT. The common (middle or source terminal) has a conductor leading to the B+ on the analog voltage panel meter. Select either battery to check its voltage. Check for a blown fuse at connection to each battery or, in the case of the house bank, at its attachment to the panel board B+ bus.

Easy peasey, lemon squeezy!