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Heelbilly's avatar
Heelbilly
Explorer
Aug 31, 2015

30 Amp Fuse Question

Hey, y'all. Me again with a newbie question. So far y'all have helped me solve the mystery of my outdoor kitchen as well as my DVD player so I'm hoping you'll help educate me one more time. In a few years, I hope to return the favor to another RV newbie...

So, I have a 2015 Cruiser RV R24BHDS travel trailer. I bought it brand new a month ago. I have had it for four weekends now and I have camped every weekend. Love it. Absolutely love it. I have been a long time tent camper but now with a 3 year old and a 1 year old I'm appreciating the fun the camper offers.

Since owning my travel trailer I have blown the 30 amp inline fuse that is beside the battery twice. The first time I blew it was during my first week of ownership and I thought very little of it, mostly because I'm new to all this. Switched it out and no more problems... Today, the same thing happened again so that got me to scratching my head. In both instances I have been running off of battery power and pulling in my slide. I'm thinking now that maybe I should get in the habit of making disconnecting from shore power be the last thing I do when taking down camp... but that's neither here nor there at the moment. I've pulled the slide in and out at least 20 times at this point between setting up, taking down, and then cleaning up at home... Only happened twice.

I checked out some basic stuff and learned a little about RV electricity as I went. I put a meter to the power converter while hooked to shore power and got a reading of 13.46 volts, which is what the manufacturer of my converter (WFCO 8955) says it should be... I disconnected from shore power and read with only DC and got about 12.5 volts, so the converter seems to be just fine. ...Well, at least based on my 1st grade level knowledge of electricity...

I checked all of the other obvious stuff too... Couldn't see any obviously pinched wires, any bare spots on wires touching screws, the frame, etc, etc... Nothing. Doesn't mean that isn't happening somewhere, I'm just saying if it is, it isn't in a spot where I can easily see it.

Now, the very bottom line is that my trailer is a month old and I have a warranty. I could just tow it back to the dealer and let them figure this out. If I can't figure it out that's what I'll do. But with the aforementioned 3 year old and 1 year old time is a very valuable thing and hard to come by! The dealer is about an hour tow.

I'm wondering if you more seasoned folks see something I'm obviously overlooking or even doing wrong. Are those slides designed to be pulled in and out when using just battery power? I just assumed they were...

Thanks for the help! Sorry for the long post!
  • I too think that fuse is a bit underated for the job. Surges could easily go over that current. If it was mine I would change to a 35 but I am not standing there looking at the wire size.

    If you want to use a breaker that resets itself you can replace the fuse with an inexpensive item shown in the link. You can buy them at an automotive store.

    Thermal breaker

    If you happen to run your battery way down and then plug in the shoreline the breaker may cycle on and off while the battery begins to fill up. Better than blowing fuses and wondering why.
  • I had a Lance overhead camper that would blow a fuse every time if it was plugged into shore power or running off the generator and we tried to raise or lower the jacks. They would only operate off of battery power. It may just be wired that way.
    Jim
  • I'm guessing it is the wrong size fuse. You have a 55 amp converter and there is no way you should have a 30 amp fuse at the battery. Just charging the battery when low will burn the fuse trying to charge at 55 amps.

    The size of the fuse is determined by the wire size. Tell us what gauge wire you have between the battery and converter.
  • The slide does operate smoothly. I don't see/feel any indication of binding. I have been level each time. Each side of the slide seems to extend or retract simultaneously. The first time the fuse blew I was retracting the slide. Today, I was extending the slide when I blew the fuse.
  • Heelbilly wrote:
    Battery voltage shouldn't have been low... but I'm speculating. It had been plugged into shore power for two days and only "unplugged" minutes before, so I'm assuming the battery should have been charged if everything is working correctly. Again, that's an assumption and we know how dangerous those can be.

    Only one battery...

    All the wiring and connections appear clean and tight.

    Each time it blew I was only using the slide. I even made sure I wasn't even running any lights and the fridge was not running on LP.

    I have not checked the water levels. It's only a month old so I assumed they were fine... Again, another assumption... and one I can easily check out tomorrow in the day light.



    Only a month and blown 30A fuse twice>>>>>

    Is slide out binding??
    Were you level when operating?
    Did fuse blow when retracting?

    7 yrs. of FT travel.....slide going in/out weekly sometimes 2X week and tripped the DC 30A circuit breaker for slide once. That was after several yrs of use.

    2X in month>>>>>>>heavy amp draw/load. NOT right even with just one battery.

    Again does slide operate smoothly, evenly OR is it jerky---one side ahead of other

    OR have you discovered later on a mashed item and wondered WHY
  • Battery voltage shouldn't have been low... but I'm speculating. It had been plugged into shore power for two days and only "unplugged" minutes before, so I'm assuming the battery should have been charged if everything is working correctly. Again, that's an assumption and we know how dangerous those can be.

    Only one battery...

    All the wiring and connections appear clean and tight.

    Each time it blew I was only using the slide. I even made sure I wasn't even running any lights and the fridge was not running on LP.

    I have not checked the water levels. It's only a month old so I assumed they were fine... Again, another assumption... and one I can easily check out tomorrow in the day light.
  • Slide outs are wired directly to battery ---shortest wiring route/less resistance

    30A fuse for slide out blowing due to high amp draw which probably means the two times it blew the battery voltage was low.

    How many batteries ---1 or 2?
    Water levels ...... voltage reading"

    Had you been placing high demand on battery prior to slide out fuse blowing?

    How good are battery cable connections....clean tight on positive AND GROUND?

    Is slide out wiring connection tight at battery?


    A properly charged battery should be able to operate slide out w/o being connected to shore power.
  • Does your camper have one battery or two?
    And what else are you running off the battery when this happens?
    Is/was the fridge on propane?
    Have you checked the water level in your battery or batteries?

    And bringing in the slide(s) on shore power is good, when you have electric power.