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Compass Marine How To | all galleries >> Compass Marine How To Articles >> Testing A Galvanic Isolator > Connect Your Test Leads
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Connect Your Test Leads

Connect Your Test Leads

First UNPLUG YOUR VESSEL FROM AC POWER !! With the AC power to the vessel OFF disconnect both green wires from the GI and connect your DVM leads to the studs.

If the diodes are working you should see a reading of .8 to 1.0. here the reading is .973..

If the diodes are bad you will not get a reading or will get the OL message (open leads) if using a Fluke. Older style galvanic isolators like this fail "open"...

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Tom Johnson 27-Jul-2014 19:18
When I checked my Pro-mariner Zinc Saver Galvanic Isolator, It took a minute or so for the diode reading on my DVM to reach the appropriate level. When it got up to .9 or so, it leveled off. When I reversed the leads, the reading was still on the meter and it counted back down to 0.
I was not using a Fluke brand, but an off the wall brand meter.
Is this possible? I am assuming the isolator is good.
The reason for the test was because I had a lightning strike near my boat which destroyed my inverter/charger and also a plugged in appliance. Nothing else seemed to be damaged.