Probably nothing. It might be prewired for a washdown pump or a swim light. There might be a wiring diagram on here for the 242. If not, email Cindy Scott at Rinker and see if she will send it to you. They are very helpful to have.
2008 280 Express Cruiser, 6.2MPI, B3, Pittsburgh, PA "Blue Ayes" Go Steelers!!!
ACC normally means it is meant for an option that your boat doesn't have. A lot of the time, Rinker just installs the wiring, so adding that feature isn't a big deal. I have re-used one of the my accessory switches and cable to power something else. Made it really easy. Just have to use a multi meter to figure out what cable is attached to that switch.
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Boat Name: King Kong
"Boat + Water = Fun"
If it doesn't power anything would the light for the switch still come on?
Mark
2019 MTX20 Extreme