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Without a schematic a crap shoot. Downriggers usually installed by dealer/owner. Invest in a dc tester (I bought a Commercial Electric Multimeter brand as a kit from Home Depot with a wire stripper and pliers). You may want to check ground. Accessories need both. For a Multimeter to work you touch one end on a positive wire and the other on negative. Keep tracing the wire......if tracing and you are guessing try a continuity test with the buzzer feature. Good luck.
Garris