Does the cart use 1 36 volt battery or 3 12 volt batteries in series.
If it uses 3 in series, your best bet may be to hook the radio to one
battery, the one that has it's negative terminal connected to ground.
There are simple voltage regulator circuits that one can build with parts
from Radio Schack. A couple of connectors, a board, a 12 volt regulator and
some capacitors ought to get you going. You could probably even ditch the
board. Of course, make sure you put a fuse from the battery to the
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