Installed a new ProMariner 1250 battery charger in my .38 Special..

When on the gen everything works great!



However, when we plug into the shorepower (which includes an adapter converting it to a regular socket) it will the trip the GFI that I plug into on the dock as soon as I throw the switch for the battery charger.


Any ideas??

Thanks in advance for your help....

Before this batt charger.... have you used the shore power before? either for the old charger or to run a fridge or A/C system?? Just wondering if anything has changed....maybe you hooked up the ground (green wire) wrong???
Or have you tried to use a neighbors shorpower outlet? maybe you have the worng AMP GFI installed there and tripping when the charger starts up and pulls juice??....

Just plugged into the actual shorepower plug in and it did the same thing..

Actually we replaced the charger to correct this problem...
Still does it..

It will not trip the breaker on the boat... it trips the breaker to the dock controling the shore power. And will not do it until I turn the battery charger on.

Just guessing, but I've seen it a dozen times........
You need to check that the polarity is correct. Black=hot, White=Neutral, green=ground.
In home wiring, the neutral can be connected to ground and often is because the hot and neutal are never reversed.
If any part of the hot or neutral is reversed in the dock shore power, cord, wiring in the boat, selector switch, charger, etc. it will blow the breaker if the boat is wired with neutral to ground.

You can not have two GFI breakers on the same line. They trip each other as they read each other as a fault. You do not need a GFI on the line from the house as the boat already has one. Try an un GFI line and you will see that it works.

It is likely that the batt charger has the green and the white joined inside it, this will trip a GFI every time. I had the same thing when the builder joined the green and white in the fuse panel

Unplug the boat from shore power.
Turn all breakers off.
Unplug the battery charger.
Get an ohm meter. Measure the resistance on the battery charger outlet/circuit between the ground and either of the outlet prong holes.
If it's near 0 ohms on either. You're boat is wired with the neutral to gound. You will have to rewire or trace where the reversed polarity is coming from.
Use the same test on the battery charger plug. If it's 0 on the charger, it's a short and that's bad, mmmmmkay?
Gary