Is there a relay that tells the battery charger to shut off??

[Linwood]

I have a Yamaha G 22, old, but solid and I like it,
It is electric,

is there a relay that tells the battery charger the batteries are charged?
I started getting charger faults , so I had a new logic board installed in my charger, no fix, still got faults after a while and it did not cut off automatically as always before.

So I buy a new charger, and it does same,
Hence my question, is there a relay or is is part of the main control module,????

I don't want to buy a new cart, which I was planning to do anyway, then I found out I had an ugly cancer,
so I am in holding pattern, ( until I kick the butt of the illness) but would like to at least have this issue fixed,

Thanks,