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“There were a few months in between finishing the re-wire and when I was able to get the boat in the water, so maybe this could be the problem as it never happened before the re-wire.”
We are onto something here. I dunno what size battery you’ve got, but that’s a lotta stuff to have on one battery. I know my electrical issues went away when I either got a larger battery or wired a separate one in parallel.
“The house battery does need to be replaced as its probably close to 4 years old…..maybe that could explain the reason why it somewhat works when slowing down to idle after a run?”
That’s your sign. We are getting warmer. Yeah, after the battery is charged after running the Garmin has the juice to act right, then when you reduce RPMs the battery strains under load. That’s my theory. I bet you’ve got a Group 24 battery in your boat.
You really ought to just have a separate battery ready to go. It’s good to have for testing/trouble shooting and for when your house battery eventually shits the bed.
I’ve got a lot of extra/spare parts I keep for this purpose and it all takes up enough space in my house/garage that I literally write off the square footage in my taxes.
So be careful going down that rabbit hole. I don’t have a wife telling me what I can/can’t have, either. LOL
“I know the installation manuals say not to run transducer cables alongside power wire to avoid signal interference, but it was already ran like that before and it worked.”
I don’t think that’s the issue. Those cables should have built-in shielding anyway. If they don’t, custom shielding is cheap: tin foil.
“I guess disconnecting and pulling the transducer cable all the way back out from under the deck and plugging it back into the unit would be worth a shot.”
That’s smart and would work, but I’m not sure that’s absolutely important to do otherwise you would have had issues to begin with.
Two final notes: you’re currently offshore and can’t access your boat, correct?
You will want to test your alternator just to be sure. I mean, if you’re getting 14v on plane, you’re good, but if that voltage is every wonky at all, then that may be something you want to replace.
