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Alex, I`m with you 99.9%. You mentioned hard wiring directly to the battery. I did that on our boat, and the unit was unable to handle the surges. For example, the GPS was on and we needed to start the engine on the sailboat because the wind died. As you know, a diesel takes a few amps to crank over--so we get a power drop. Then the beast starts and a 160Amp alternator kicks in. The Garmin craps out. We solved the problem by putting a capacitor in line--took care of the fluctuations--no problem since that time. I don`t know whether that would apply to the more modern Zumo.
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