Hey all, wondering if someone could shed some light on an issue I’m having. I have a 95 rustler tt, 24ft. Not sure the specific model. Parked it last fall everything was working fine. I had the battery removed so it wasn’t left in the cold. Kept it well charged over the winter. I recently went to get the trailer going for the season, installed the battery and for some reason no power to the fridge, range hood (only the battery level indicator and tank monitors) and the propane sensor located below near the floor. The other functions on the range hood are working such as the light, fan and water pump switch. I’ve checked the fuses and they are all fine. Plugged into a/c from the side of the house and same thing. Can’t figure out why only these three items are without power. The fridge outlet at the back of the fridge is live so I assume just the controller (thermostat) portion runs on 12volt. I don’t know much about how these things are wired so any insight would be great before I haul it to the dealer to have it diagnosed. Thanks in advance.

If you accidently hooked the battery post backwards, or even just arced a spark while hooking up the battery, it may have blown a fuse either in the fuse block near the battery box, or the 2 fuses located in the back of your converter/charger. Follow your positive cable to the fuse block to check for a blown 12v circuit breaker or inline fuse.Undo your battery cables and plug in to shore power to power up your 110 to 12v converter. With a volt meter check the positive and negative power at the battery cables. If the converter is working you should see between 13 to 14.5 volts.Your refrigerator, and furnace have a circuit board that runs off of 12volts, therefore it wont work if no 12v is present, or if voltage is below about 10volts from the battery.

Ok I will look for the circuit breaker but I did have power to everything else so it doesn’t seem like that would be the culprit. All the lights, fans, furnace etc were working. Just the fridge panel, tank indicators and the propane sensor were dead. Could a faulty converter produce these symptoms? I’m hoping it’s just an easy fix. I checked all the fuses at the converter and also removed the front panel and found another inline fuse, all were testing fine. Can’t seem to find any more fuses. Are there more that I’m missing? Maybe by the battery at the front?

Take the outside panel off the fridge. Maybe there’s a fuse in there?If all of the fuses are good, you’ll have to look for a disconnected wire. Any chance there’s a extra positive or ground wire at the battery that a previous owner used to power those items?Also, be sure to swap a fuse from a known working circuit into each of the other places to see if that helps. Sometimes “good” fuses aren’t.

Number one check that the batteries are connected correctly. Red or black to positive and White to negative. Make sure you didn't miss any wires, look carefully around and under the batteries. After that check the fuse panel and check all the fuses. I'm guessing you have a bunch of 10 and 15 amp fuses and then one or two larger maybe 40 amp fuses. The bigger fuses are your reverse polarity fuses, check them carefully. Make sure all the fuses are good. The best way is with a meter. If no meter then pull them and inspect.

At first I wasn’t thinking backward battery cables but the things you listed are the ones that wouldn’t work if reversed. The fan, lights and water pump would work either way.If it is reversed the large fuses on the converter are likely blown so plugging it doesn’t change anything.

Electrical problem | Good Sam Community

14 Replies

opnspaces
Navigator III
May 09, 2019
Got tired of dealing with Captcha so post deleted.
westend
Explorer
May 06, 2019
Check for fitment of the deck mount converter in the right side of the load center. Remove old charging components. Verify which wires are (+12V) and which are (-12V) polarity. Don't trust a color scheme to get them identified. Follow the instructions with the new converter. The two wires that enter the charging section of the box (black, white) that are larger than others lead to the battery. Verify that with a meter.
Good luck.
Griffin
Explorer
May 06, 2019
https://ibb.co/4PLQ1h4
https://ibb.co/WvbVQj4
Griffin
Explorer
May 06, 2019
Ok so after much investigating and not coming up with anything i had the trailer looked at by a professional who confirmed that my converter is toast... so i bought a deck mount WF-9855 converter. Just looking for a little guidance on hooking it up, it seems straightforward but i can't figure out exactly where i should be hooking up on the 12v side. I will try and post a couple pictures of my panel.
Griffin
Explorer
May 06, 2019
wf9855 installation
PNW_Steve
Explorer
Apr 24, 2019
I got called out to address a similar situation.

First camping trip of the season and he hooked the battery up backwards.

It took out the control circuit board in the refrigerator and the converter.
wnjj
Explorer II
Apr 24, 2019
You may have to turn some screws. The reverse polarity fuses aren’t usually part of the DC panel but on the converter itself.
Bob_Sue
Explorer II
Apr 24, 2019
Now you will have to check the 2 fuses on the front of the converter. Probably 30 amp.
Griffin
Explorer
Apr 24, 2019
Ok I’m thinking I would have connected the battery wrong after doing some reading. White is ground.... stupid mistake. So the question is, where the heck are the reverse polarity fuses?? All the fuses at the panel are only 15a, I’m thinking they would be more like 30 or 40a.
wnjj
Explorer II
Apr 23, 2019
At first I wasn’t thinking backward battery cables but the things you listed are the ones that wouldn’t work if reversed. The fan, lights and water pump would work either way.

If it is reversed the large fuses on the converter are likely blown so plugging it doesn’t change anything.

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