Charger circuit breaker flips after a minute or two of charging

[haveaclubcar]

This is my first post, I have read several threads but did not see my problem. Just bought a 2002 club car third hand(it had been turned into a stretch in 2007). The charger will click on about 5 seconds after plugging the cart into the charger. A little while later(like 3 minutes) the charger circuite braker (the 15 amp one) trips. If I try to reset it imediately it will not set but a few minutes later i can usually reset it and it starts charging again. i can usually get a full charge after doing this cycle 8 to 10 times (eventually it will keep charging). When i got the cart the batery indicator was blinking the left two most bars(that symbolize the lowest charge) in an alternating manner(left then right then left....). The person who sold it to me said i just needed to replace that indicator. I removed the indicator and it reset itself when i reattached it( and seemed to work for that charge) it shows the battery level but does not seem to be accurate(showing full charge when it is not).
I am ready to buy a new indicator but wanted to know if i have a deeper problem. they said the battery's were completely dead when i bought it and the cart had not been used in a while(so left uncharged for a long time) so they charged them for me. the batteries are 3 years old(and it is a 48 volt system). Thank you for helping newbies like me out! this is an awesome forum!!
Thanks in advance!