Originally Posted by tervio
We have lost all 12 volt power, the 30 amp that blew is the green fuse on the converter not the one out by the disconnect by the battery. We have a '04 2363 trailer. My converter does look like the one in your picture.
Snip form earlier post too
Today on our visit I walked into the trailer and pressed the battery level on the control panel and it flashed for a second then went dead. The refrigerator had no lights and was warm, we have no dc power. I did find a blown 30 amp battery fuse and when I tried to replace it, the new fuse blew. Everything was working fine until this weekend. Can the power converter be bad? Is there some things I can check before I purchase a new converter?
H’mm the 30 amp on the convertor blew and you have the same one I did. Well the good news is we can talk and point to my pics I have before I ripped mine out….since yours is 200 miles away.
Now to that 30 amp fuse, something odd here unless I misunderstood.
Did both Green 30 amp fuses blow or just one?
See here for the CX6000 and the 12 VDC fuse block I had on my 2004 T310SR. The yellow wire is the + 12 VDC from the convertor and it bolts directly to the 12 VDC bus bar. The convertor is capable of producing 60 amps DC. The battery charge circuit can only take 30 amps as the resettable circuit breaker out on the TT header will limit any more then that. And most likely only uses 13 amps on a good day pending the size battery your have when charging. The 60 amp supply allows the rest of the power to work the camper while charging the battery.
And now see here with the cover off the 12 VDC fuse block exposing the 12 VDC bus bar.
The heavy red wire up top goes out to the battery. It is fed from 2, 30 amp fuses using number 10 awg wire to that heavy red one.
Those 2 green 30 amp fuses really only protect the battery charging red wire in both directions, Battery to 12 VDC bus and Convertor to battery . Something may be shorting out on the heavy red wire up to the battery or the convertor has a dead short and the fuse is blowing because the battery is providing the power.
The actual convertor when it is working is protected by internal circuits that shut down the 12 VDC when an over load or system short occurs.
Before I go too much further, did you blow 1 or 2 of those green fuses? That means a lot to the trouble shooting misson
If you only blew 1, then a short may still exist pulling the convertor down and not giving any 12 VDC to the camper from the convertor.
If you blew both green fuses, then you have no 12 VDC from the battery but yet the convertor should still power up the internal 12 VDC if it is not damaged.
There is also a glass fuse on the convertor in the 120VAC line that may or may not be blow.
And this may be of some help. This is a pic inside my 2004 T2499 junction box on the frame header.
Since you said you blew a 30 amp and then replaced it (was it 1 or 2 green 30 amp fuses and blew another one) well are back to did you blow 1 or 2 fuses.
Let me know and I can guesstimate from there where to start digging.
I would trouble shoot in this order if you feel you can safely handle this
1. Remove all 120VAC.
2. Turn off battery disconnect.
3. Pull out both 30 amp green fuses inside the camper.
4. Using an Ohm meter, check the heavy Red wire to Ground. You are looking for very close to 0 ohms here on a dead short. 2 or 5 ohms is still a dead short. If this is good then:
5. Unbolt the heavy yellow convertor + 12 VDC wire from the DC bus and using an Ohm meter, check the heavy yellow wire to the DC common or heavy white wire. You are looking for very close to 0 ohms here on a dead short. 2 or 5 ohms is still a dead short. If you are up on killo ohms that can be internal resistance in the convertor and may be OK.
6. I suspect a short to ground or DC common has occurred somewhere to take out a 30 amp fuse.
7. Check the battery voltage. Is the battery drawn down dead?
Once you are past this and no shorts then that will lead you on a power up path of just use the 12 VDC from the battery only and no convertor tied to the 12 VDC bus. If the battery has life and powers up the camper and no fuse blows then that points to the convertor. Before I would reattach the heavy yellow to the camper 12 VDC bus I would power it up and check voltage output put be care full that has a high amp output if it is working.
Hope this helps