Nav lights- master switch- toggles

[Wilhelmjon]

Hey all! I am working on a 1997 ProCraft 185; boat has been sitting since 2013 under a cover. All fresh batteries in it now. When the master switch is turned on next to the key; then turn on Nav lights on the switch panel by the throttle, when any other switch is hit all power to lights on dash and front controls by the trolling motor go dead.

I am confident it is a corroded connection somewhere causing resistance; when I get the lights on there is no flickering like a loose connection. Any good pointers where to check common corroded connections; I’d hate to start snatching wires from their switches and cause a bigger problem.

Thanks!

[Jonestrollingmotor]

You should have a 10ga wire feeding a fuse box under the dash. Start by looking at it and all the fuse connections.