Safeshore Galvanic Isolator DC Fault

[Jen-in-Wellies]

Just installed a galvanic isolator on a friends boat, who didn't have one before. It is a Safeshore Marine GI70SM, with the remote status monitor LED's. When testing with the supplied PP3 9V battery a single LED lights, switching to the other one when the polarity is reversed. This, according to the destructions, indicates a DC fault. I've turned off both the engine and house battery isolators and it still shows a DC fault. Any clues what is going on and where I should be looking? The boat end of the isolator is grounded to one of the engine bed steel beams with a ring terminal and an M8 bolt in to a threaded hole.

 

Jen

If only he had bought the one without the blinken lights, then we wouldn't have known and wouldn't have worried!

[dor]

Isn’t that what would be expected with a 9V source?

[jonathanA]

The 9v battery is to test the GI. No lights on with the 9v test battery removed all is good ....

 

[Jen-in-Wellies]

Thanks! I've just watched their "how to install" video and it says the same thing. Had a spot of brain fade there. Should have worked it out myself. All is well with the isolator.

 

Jen ?

[Boater Sam]

The LEDs cannot be permanently connected as they would bypass the GI diodes and prevent it functioning.

[Jen-in-Wellies]

31 minutes ago, Boater Sam said:

The LEDs cannot be permanently connected as they would bypass the GI diodes and prevent it functioning.

Not so. The LED module on the Safeshore GI are permanently wired. They only come on when the GI has a potential difference across it big enough to light them and put the diodes in the isolator in to conduction. Either from a fault, or when tested with a 9V battery.

 

Jen

See from 3:45 below.