I have an electric snowmobile helmet with a RCA plug and not instructions. The black wire has a connector for the screw terminal on the battery, but the red wire is bare. What do I connect the red wire to?
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Generally the red wire would be attached to the power source. It could be connected directly to the positive battery terminal or attached to the fuse box. What ever source you use, it must include a fuse or circuit breaker to prevent an overload and potential fire hazard. We can't see all that is included in the wiring. It is possible that there is a fuse in the wiring that we are unable to see. The black wire can be attached to either the negative battery terminal or a chassis ground.