25v is ok... remember each cell is about 2.1 to 2.2v.
so count the number of caps on the battery(s) times 2 and that is the nominal voltage of the battery. 12 fill caps is 24v, 18 fill caps is 36v etc. for flooded batteries.
Ok so replacing the deadman switch didn't help. Battery voltage is good enough.
Did you ohm out the fuses and make sure they were good? You did say you found them earlier.
The metal plate has battery voltage on it? what other information is on it?
model number maybe?
1996 EASI 57B9603578 doesn't tell me enough, that looks like a serial number to me.