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I dont know what kind of kit you have, but most aftermarket kits are just plug and play using the factory harness. You dont need to power them from your battery.
get a kit with the wire that connects to the battery. you'll be glad you did.
this guy selling mcculloch kits (which don't come with a wire that connects to your battery) actually posted a write up on how to make a wire harness so you don't fry your stuff. lol.