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.

  • I've added another picture of the wires. No fuse that I can see. The battery does have another adapter coming off it but it isn't RCA. That looks to have a fuse
    – extraordin
    Feb 22 '20 at 0:55
  • Everything mikes said was correct. But just a quick note: if possible, avoid connecting the red (+) and black (-) wires directly to the battery terminals. There is nothing "wrong" with doing it this way, but it is a little "sloppy" and not the "proper" way to wire accessories. As mikes said, try to use an existing accessories connection on the fuse box for the red (+) wire, and a frame ground for the black (-) wire.
    – sam
    Feb 22 '20 at 0:56
  • I've added a picture of the battery that looks to have an accessory adapter and fuse, just not RCA.
    – extraordin
    Feb 22 '20 at 0:58
  • Hmm I see. In the third picture, is that the RCA plug on the left hand side? It looks like there are 2 wires coming out of the RCA plug, right? Those 2 wires should go to the positive and negative battery terminals. There should be a fuse between the positive battery terminal and the RCA plug. Is that correct?
    – sam
    Feb 22 '20 at 1:03
  • 1
    A word of caution: take care that the unplugged loom portion permanently installed to the battery is free from any possibility of shorting. I bought a second hand Harley that the original owner had wired for a heated rainsuit (<cough> <cough> sally <cough>). Long story short, I found myself at a remote scenic outlook unable to get any life in my bike. It wasn't until I simply moved the positive terminal away from an adjacent frame member that everything sprang back to life. Lesson learned.
    – user16128
    Feb 22 '20 at 1:23

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