I have a Garmin 545 that loses power off and on when I hit a hard wave. This is my second unit....the first did the same thing and was determined that the head unit was the problem and it was replaced by Garmin with a new unit.

I have the 12V connected to an ignition switch which is always hot, and all cables, and connections are only 2 years old????? My thought is I have a bad cable, plug, or fuse holder....anyone else have thoughts.

Thanks!

Anyone???

That's what these units do when their power drops for
an instant due to intermittent wiring problems.

Somewhere you have a poor connection. Finding it is
another matter. You have to carefully visually inspect each
and every connection between the GPS and the battery, both
on the hot side and the ground side. Make sure each screw
is tight, each spade lug is tight, or whatever is there. Fuses
and fuseholders can get oxidation and need a decent cleaning.

Besides being an electronic engineer I've trouble shot this very problem a couple of times on my own GPS installations
and several other times for friends. It never turns out to be
the GPS.

Either that, or add a completely new hot and ground circuit straight from the battery that you built yourself so you know what you have. But really, don't even do that unless you fuse it asap after it comes off the battery. Always use fuses.

Pesky Varmint

ok thanks. I just ordered a new cable from Garmin, I'm going to replace that and see what happens...basically starting fresh.