Only one drive moves with trailer switch

[muskyfins]

1997 Larson 310 with twin 5.0 alpha 1

Both motors trim fine but when using the trailer switch, only the port motor moves. I don't think this is a limit switch issue because the trim buttons work fine. Same goes for pump issues. My guess is wires (hopefully at the switch itself) Any other suggestions?

 

[tpenfield]

That would be where I'd look first . . . the trailer switch.