Re: 1988 36v marathon HOT battery
You could try swapping your battery 2 location with a different battery and see if the voltage still drops on that same battery. Hopefully battery 2 is not the new on you just purchased.
Can you post a picture of the batteries and their wiring? Maybe there is something someone will see.
Also, you could connect your voltmeter with some alligator clips and monitor the voltage while you're driving it. The voltage should sit around 35v while it is moving and go back up to 37-ish volts when the accelerator pedal is released. If it gets down to 32v while driving, that is about the time it needs to go home for a charge.
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