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1983 Honda vt750 Shadow
20,605 Posts
We don't have Harley wiring diagrams, but it may be there is a back feed from the tail light bulb or wiring .
Is it all factory lighting or has been changed to LED ?
Any modulator connected to the brake circuit?
Take out the rear bulb and see if that extra power goes away.
Sometimes just have to start disconnecting things to test a back feed.
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