I've got a three bank charger, cabelas prosport 120. One battery was not charged yesterday after being on charge for a week.

Getting a reading of 13 volts on two banks and - 1.?? on 1 bank.

Should there be the same voltage on each bank?

Is there any thing I can do to fix it or is it trash? It is an older charger.

I bought this charger used a couple years ago, the lead that is dead has been spliced. The splice has tinned wires and the tape is good shape. I checked the volts before the splice and got nothing. Appreciate it if somebody could help.