Hi. There is often an in-line fuse for the voltage to run the controller. Often the charger feed goes through this fuse. Check the fuses. Sometimes the fuse is OK, but the contacts in the fuse holder are faulty. Also check the battery connectors, and where the battery leads are fixed to the batteries.
I have removed many connectors from battery leads and connected the leads to the batteries without in-line connectors.
Good luck. Neil.
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