There can be a few reasons why but you might have to supply more info so, here are some things to check.
Battery connections are they clean and no corrosion noticeable? Grounding problems can and will be an issue with any electrical on the machine and how old is your battery? Is it holding a charge, is it charged?
Shorted wiring: water in connections, grounded to frame, broken wires, just things to look for. Look at all connections and clean them. Use die electric grease in the connections to keep moisture out. Start here and post back. Hope this helps a bit.....
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