thanks. I could not get a good picture, but here is how I wired the system.
The THR-115 instructions say the BLACK wire is GROUND but there is no BLACK wire on the unit. I assume the
BLUE wire is the GROUND. I left the YELLOW unconnected.
It is starting to sound like a faulty controller. Before we narrow it down to the controller though could you please check and verify that the cart's frame is not grounded to the battery pack?
Grounded frames are known to cause problems like this. The frame should not be connected to the ground or positive leads of the battery pack.
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