Originally posted by bc545571443
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but I don't know exactly what you are referring to;
marine wire 'standards' come from the ABYC -
American Boat and Yacht Council
here is the ABYC wire "ampacity' chart:
Yamaha offers two Aux leads specifically for the 4.2L model,
which fits that unique engine plug;
one comes with a supplied circuit breaker,
(note the amperage of the CB)
or you can buy the same wire, "by itself":
The wire needs to be "fused" at both ends -
since it can be "powered" by both the alternator and the battery;
Your Owners Manual shows the fuse that Yamaha installs
to protect the Aux lead ("Isolator") at the engine end:
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