[Cartmaster]

Listen to bronsonj and Scottyb,

As you know the cart runs, and it seems like most of your issue is with old batteries, I would suggest you go get a new pack of matched batteries and start again. The batteries are the most important part of your cart and need to be strong and healthy. I would also recommend installing all new high amp cables too.

Any testing without healthy batteries is a waste of time.

If you are concerned about the cost, just remember, a running cart these days has a pretty high value so you wont lose out even if you end up selling it working.