Switch issue.

[Three B's]

Lately turning on the electronics switch after throwing the main on kills both. Any ideas, is this a solenoid issue? Doesn't happen all the time, and I can get both to work by shutting both off and throwing on again. Sometimes need to do this a couple of times to get them to both stay on.

[deepwater]

Switch Issue

Not knowing what boat you have I would think that you have a high resistance somewhere between the main swith and the electronics.

What is probably happening is either the main or electronics switch contacts are dirty and when you add a load to the circuit the contact resistance can't pass the required current and the voltage is dropped across the switch contact causing a loss of voltage to the equipment.

[Three B's]

Switch

Sorry, boat is 2003 28 w/ twin cummins 250 4BTA's.