Originally Posted by Salty John
You should try to keep the distance between radio and antenna to no less than 1m or so.
I'd look carefully at your connectors, it's very easy to snag a strand of the conductor as you pass it into the PL259 causing a short. With the antenna and the radio end disconnected there should be no continuity between centre pin and the PL259 body on a multimeter.
I resoldered the connectors as I thought it might be a stray strand but there's nothing that I can see. I'm going to move the antenna temporarily to the back of the double jockey seat (at least 1m away from receiver). I need to order some more co-ax (more than I need), as the final destination with be on a transom pole, then routed through the under-deck trunking.
I do have a multimeter, so checked the resistance tonight. No resistance at all, reading was 0 ohms. I'll try moving it. If that doesn't work, then I may have to send the receiver back to ICOM, although I'd rather not... considering I put a bead of sikaflex around it when it was installed.