This is a repair Tim did on his 36 Grand Banks Europa. All GBs should be the same.
To make this replacement exciting, Tim did it in the rain with the shore power energized. Send condolences to Trish at…..
The incoming shore power for Grand Banks are protected by these fuses and fuse holder. The same units are used by Hatteras and possibly Bertram.
There are one of these for each leg of the incoming circuit.
The fuse holders have a simple circuit with a light indicating either fuse blown or good. Not sure which, since I have never seen one working. You don’t need the light working, and can buy the holder without it if you chose. If you blow a fuse, and aren’t comfortable fixing it, try powering the boat from the other shore power connections to power the boat till fixed.
The fuse is a dual element common type. It protects the cable and vessel from a short circuit, deteriorating cable, or bad connection. Usually a 250V 50A fuse is required but can also be 30A.
The fuse holder threads are very fine, and subject to corrosion resulting in it welding itself to itself. Grease these up with a dilectric grease or axle grease as a last resort.
Corrosion occurs from the clear cover cap cracking, allowing water into the shore power protection scheme, not good! I always flench when my shore power connection gets wet.
I want to refinish the teak trim on mine, and these pictures show how the panel comes out for shore power and the shower valves. I will do my shower handles soon.