Join Date: Aug 2006
Location: Arlington, VA
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Check the connections on the chartplotter terminal end; also, could be an intermittent caused by a stressed or broken wire....when you moved it to the battery it worked.
I agree it's unlikely the switch but, hey, stuff happens on a boat :-)
Before you replace the switch, hook up a real load to the post the chartplotter and battery monitor are on. A big 12V lightbulb or other 12V load. Or, move the SSB terminal to the other side of the switch and transmit. If that works OK, then it's not likely the switch at fault.
BTW, connecting your SSB to this switch is not the same as a direct connection the battery. There are other loads on this wire. Best practice is to use AWG6 cable directly from the house battery terminals to a post or small terminal strip located near the radio. Use a 30A fuse in BOTH the positive and negative cables.