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Electrical problems

I have a 2015 231cc. Dropping voltage everywhere behind dash. 12.7 volts. As soon as the power switch is turned on voltage drops to 4 and relay starts chattering. Can anyone send me a wiring diagram or schematic for my boat. Please help. Thanks


  • cjjjdeck
    cjjjdeck Member, Moderator Posts: 1,872 ✭✭✭✭
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    2012 SD237 I/O Mercruiser 5.0L MPI ECT/ Bravo 3
    2012 Load Rite Elite Tandem axle trailer