Join Date: Aug 2008
Location: East Tennessee
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Re: Troubleshooting electronics
Got a digital multimeter? You are going to need one. First a visual inspection of the wiring looking for corrosion on junctions, such as terminal boards, breaker connections, cable connections, ect. Next, well maybe first, measure the battery voltage while the devices are on. Measure at the battery and at the device if you can. When I wired my boat I ran all the negative wires back to copper buss bars. Check that also. Sometimes corrosion and vibrations will break the wires inside the terminal lugs. If the Garmin fires up (display shows normal) and it has an external antenna, check the antenna connections. Has the Garmin moved from where it was working? It could be something is blocking the satellite signal, there isn't much RF signal margin in the GPS signal. Digital multimeters are not that expensive any longer. You don't need a $3,000 dollar bench top Fluke, a $30.00 one will do just fine.
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