RV Power Problems !

We have 5th wheel with 50 amp. I had two situations where half the trailer did not have power. Turned out the first time was one of hte hot wires in the power cord came out of it's home in the plug. Second time was the power box at the campground.

Also check both GFI's if you have two.

Plug the trailer into the Tow Vehicle, if 12v works, then you need to take care of trailer battery.

Dead battery.

Since your microwave is powered by 120VAC, that tells you that side of the circuit is working. From there, the 120VAC goes into your converter and you get 12VDC out. The 12VDC powers all the systems you said aren't working. When this happens to me, I follow this procedure:

Disconnect shore power

1. Visibly inspect the battery connections to make sure that the cables are installed with the correct polarity. One some rigs, black is +12V, and white is ground.
2. Using a meter, check your battery for DC voltage. Hopefully, it's over 12VDC. If it is:
A. Check to make sure you don't have an in-line fuse that's blown
B. Check to see if you have a battery disconnect switch that is off.
3. If you still haven't found a problem, disconnect the battery terminals and make certain you're not plugged into shore power. Then, pull off the cover for the converter and slide the converter out of the housing. There are typically one or two fuses on the side or back of the converter that are in the 40amp range. Pull these fuses and check that they are good. If bad, replace them with new ones. If good, put them back in.
4. Being very careful to follow safe electricity practices, reconnect the battery, and plug into shore power and check for 12VDC (actually about 13.5VDC) output on your converter where the wires come out that go to the battery. If you have no DC voltage at this point, then your converter has likely failed and needs replacing.

Check for an in-line fuse just after the battery. I had the same problem last year and this fuse was blown.

Hi,

Is the battery disconnect switch turned to the off position?

Here is simplified 30AMP wiring configuration for RV trailer...

Might help you with identifing things...


Note the bottom description for the Inverter should read 12VDC to 120VAC verses 120VAC to 12VDC as printed...

Roy ken

Do you have a known good battery installed? Most everything inside an rv runs on either gas or 12VDC. If you have a battery, start looking for battery disconnect if you have one. Then check all rises, then using a volt meter start tracing from the battery your power.