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When master switch was turned on, a busing sound came from under dash, then quit. The next time out, none of the auxiliary switches work, depth finder, stereo ect. I am no where near a dealer. any ideas? No tripped breakers and a meter shows 12.4 volts across the back terminals of the master switch when it is off but 0 when it is turned on. 2011 196 Fun Deck.