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Thanks for the quick reply,
I am experienced with electrical work but was trying to save time chasing down whats hooked up where.
Also the pdf drawings for the boat from whaler show the boat with trim tabs installed so it must have been a factory option. There are unused wires / circuits tied off and bundled up inside the console. I was thinking that whaler may have included those as means of powering tabs or other accessories but only a schematic from whaler would tell me that.
I may try calling but given the age may be out of luck. I owned a 1984 Tiara Pursuit 21' walk around and even back then Tiara had a complete wiring schematic included in the owners manual, a little surprised that a 1999 Boston Whaler wouldn't have one. The Bennet tabs need one circuit with a 20 amp breaker plus two low voltage connections one to helm power for power on to unit and one to ingnition to retract the tabs automatic at turn off,(optional installation).
I will be replacing a 10 year old GPS unit that still functions , just figure its time, so I'll just use same connections
for that part.
Boat has double battery set up that was factory installed per original owner.
Thanks agin,
J