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Another option if you have jumper cables, would be to connect the truck batteries to the RV battery with them and try running the slides. If that works, then it indicates a faulty battery in the RV.
Turn off all other 12 volt loads. I noticed that you had the water heater set to electric. I don't know if that is 120v AC or 12v DC.
For a fifth wheel, I would expect the converter to be rated for at least 45 amps. That should be plenty for running a slide. You may even be able to run a slide with no battery installed.
You may have to start tracing wires. Since all four slides are non-functional, the problem has to be closer to the battery or fuse.
When I got home with my new to me 5th, the wardrobe slide wouldn't move. Everything worked fine on the pre-buy. Found the spade connector supplying power to the slide controller pulled off. This was a Schwintek.
After checking everything you have, I would be looking for a poor/loose connection in the system where there is only common power points. There seems to be adequate power to small appliances, but a large draw like a slide fails. Also, the low amperage/voltage from batteries or converter sounds like a good place to start.
As you said, under load testing is required.
Hood to hear your trip was not cancelled. I have to raise and lower our 5th wheel by hand one time, started carrying an impact gun with a chuck on it after that.
Do you not have a DC circuit breaker located close to the batteries, usually mounted on the wall of the front compartment? Follow cable off battery to locate. Maybe resetable, maybe not.
Do you not have a DC circuit breaker located close to the batteries, usually mounted on the wall of the front compartment? Follow cable off battery to locate. Maybe resetable, maybe not.
No. I don't know you rig so I am just trying to run it in my head. Usually there is a set of breakers (slides, landing gear, etc) that are fed by the batteries ahead of everything else. I think your problem will be easy to resolve once you trace the circuit. You can try undoing your swithc panel and checking for voltage at your switches, but I am betting thers is a common lead feeding the fuses so they will be dead. Could be wrong. Hard to troubelshoot at a distance. When I am lost, i put a toner on the cable and start tracing. Just my guesswork from here.
As I think about this, the switch panel is not the problem. When I push those buttons the red ligh comes on because there is no power on the other leg of the fuse. There is a panel under the basement with four 25 amp fuses that I think you are referring too. they all appeared good. but what I can do is disconnect and reconnect those wires for the fuse block. Will take a picture so you know what I am talking about.
going to wait a bit, it is 38 deg outside, burr.....
As I think about this, the switch panel is not the problem. When I push those buttons the red ligh comes on because there is no power on the other leg of the fuse. There is a panel under the basement with four 25 amp fuses that I think you are referring too. they all appeared good. but what I can do is disconnect and reconnect those wires for the fuse block. Will take a picture so you know what I am talking about.
going to wait a bit, it is 38 deg outside, burr.....
You got it. I think there is almost zero liklihood it is is switch issue. If you have a meter, check your fuses for voltage. I bet they are dead so the hunt is for what feeds them. If you have some wire, you can jump the fuses by hooking a battery to the terminal. Or if you do not have a battery handy, just run a lead from you house battery, but use a fairly heavy guage, maybe at least 12 ga. Have someone (I use my wife ) push one of the switches while you put a wire to the fuse terminal. Slide should move.