Question Magnum inverter main fuse

[lostinfla]

Somehow, the main 350a fuse has blown on the inverter after I tried to "reset" systems by cutting shore power, turning off the engine battery switch and salesman switch. Does anyone know how/why this happened and what is the correct procedure for fuse replacement as I don't want to fry another fuse when installing it.

 

[Joe Hogan]

Wow, that is a big surge. In my opinion you should be sure there is not a dead short somewhere in your system before you install a new fuse. The power needed to fail this 350A fuse can damage all sorts of things.

 

[Chuggs]

More than likely a loose connection. Check connection points... two nuts and washer hold the 350A T-Fuse on. Make sure Negative is always connected to the inverter before adding the positive on Magnum systems with peripheral devices.

 

[lostinfla]

I actually connected the two wires together to make sure the system was ok, and everything powered up correctly, so I would assume there's not a short circuit anywhere. When connecting the wires, I got a small spark, but no where near what 350 amps would indicate. These are extremely sensitive quick blow fuses, but I can't see any reason this one went. Doing a search, I've seen others come up with the same problem (low battery indication, no charge on the panel) which led me to find the blown fuse. They just replaced the fuse and all was well. I just don't want to toast a 100.00 fuse.

 

[Chuggs]

Blue Sea Systems 5120 FUSE A3T (CLASS T) 350-AMP Amazon.com

 

[lostinfla]

Blue Sea Systems 5120 FUSE A3T (CLASS T) 350-AMP Amazon.com

Thanks Chuggs!

 

[lostinfla]

Ok, I think I figured out what went wrong. I removed the fuse before cutting the 110 feed to the inverter which may have caused the fuse to blow. I installed a new fuse and powered up the coach and everything is working fine EXCEPT... I have no power on the kitchen slide to the receptacles. The microwave works as does the telivator, but no go on the wall outlets. I have both legs of shore power coming in. Before I dig into the wiring, I figured I'd ask here to see if there's any hidden GFI's other than the three in the mid bath and one in the peg board bin. One in the mid bath was tripped, but didn't change anything on the slide. The GFI in the peg board bin has no power also. If anyone can add any info as to the slide wiring and where the feed comes from, it would be much appreciated!

 

[NWIP]

We have one GFI under the cabinet above the sink

 

[lostinfla]

We have one GFI under the cabinet above the sink

Thanks Bill, no power there either

 

[Neal]

Sounds like you blew the GFI breaker and it needs to be reset on the outlet with the reset button.