generator battery not holding or being charged?

[tracyt3]

My generator battery will not charge from engines,chargers or
generator. Eventially after a few starts it drains the bat down. The
battery is brand new, when I try to tie the coach batteries it will
not, there used to be a clicking noise when I tied the bats not now.
where do I begin, is there a relay or somthing that I should check? I
have a 1985 Pt40 Thanks for any input.

John Mann
1985 pt40
Granbury Tx.