BobOdenweller
Well-known member
I think that will make a big difference. It may not completely eliminate the problem but it will get you a lot closer. Are the Powerlet and Starcom grounded to a fuse panel? If so I would make sure the fuse panel has a good ground directly to the battery using 10 or 12 gauge wire.I think I'm on to something. I thought I had tested with Garmin on battery but I guess not. The noise is present when Garmin is plugged into glove box but not present when on internal battery. Since I have a powerlet wired up to same source and ground as starcom I will order a cigarette to powerlet adaptor and try that to power the Garmin.
I would go ahead and also the the ground loop isolator cable that will go between the Garmin and the Starcom. Go to eBay and do a search on PAC SNI-1/3.5. You may also need a gender changer like this one: https://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...em=250593681414 .