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Old 05-22-2013, 09:03 PM   #1
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Fuse instantly blows

Hi, i own a 2010 8528 fifthwheel trailer. I recently setup for the season and immediatley noticed a blown fuse(with red light indicator). I tried several times to replace the 15 amp fuse but it sparks and blows instantly. It is the number 2 slot on the electrical box blelow the refrigerator.

Reading on the subject i blive i may have a short. The fuse is connected to four lights in my living room slideout, one under counter light and the stove ventilation unit. I opened them all and only noticed that the light pver my dining room table had several internal wires which the isolation seem pinched/crushed so i disconnected the light completely and removed it. However problem still persists. Need help please!
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Old 05-22-2013, 09:27 PM   #2
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Blowing the fuse instantly does indicate a dead short in the wiring or in the device/appliance on that circuit.

Since you have crushed wiring, that is highly suspect and likely your problem. If the light is downstream on the crushed wire, removing the light will not isolate the problem. Usually when a wire gets crushed, the wire itself gets exposed. And when that happens, all it takes if for that wire to touch the chassis/ground wire, and you have a short.

Too fix it you will have to carefully inspect the wire run. If the wire is significantly damaged, it will have to get replaced. Whatever is causing it to get pinched/crushed will have to get fixed too.
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Old 05-22-2013, 09:40 PM   #3
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Blowing the fuse instantly does indicate a dead short in the wiring or in the device/appliance on that circuit.

Since you have crushed wiring, that is highly suspect and likely your problem. If the light is downstream on the crushed wire, removing the light will not isolate the problem. Usually when a wire gets crushed, the wire itself gets exposed. And when that happens, all it takes if for that wire to touch the chassis/ground wire, and you have a short.

Too fix it you will have to carefully inspect the wire run. If the wire is significantly damaged, it will have to get replaced. Whatever is causing it to get pinched/crushed will have to get fixed too.
Thank you for the quick response, the crushed wiring was withon the light fixture. I removed the fixture completely(cut the two wires connected to the fixture) and the problem persists(wires ard simply hanging from the ceiling, not connected to anything nor each other
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Old 05-22-2013, 09:50 PM   #4
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Thank you for the quick response, the crushed wiring was withon the light fixture. I removed the fixture completely(cut the two wires connected to the fixture) and the problem persists(wires ard simply hanging from the ceiling, not connected to anything nor each other
If the light is in the slide, I would inspect under the slide for a pinched wire. Had one on ours as soon as we got home from the dealer and put the slide out and poof, blew a fuse. Found the problem where the wire runs from the bottom of the slide and starts up the side.
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Old 05-22-2013, 10:02 PM   #5
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If the light is in the slide, I would inspect under the slide for a pinched wire. Had one on ours as soon as we got home from the dealer and put the slide out and poof, blew a fuse. Found the problem where the wire runs from the bottom of the slide and starts up the side.
I will definately have a look. Would sure beat having to play with the wiring within the . Thank you.
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Old 06-19-2013, 12:42 PM   #6
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I will definately have a look. Would sure beat having to play with the wiring within the . Thank you.
I finally checked the underside of the slide out. Wire looks fine. Could the cicuit bourd on the control panel be malfunctionning? I could remove another 15amp wire from the circuit and replace ith with the wiring that i currently have trouble with. If the fuse blows. Ir would indicate a ahort of some sort . If it works then it would indicate a problem with my #2 slor on rhe circuit board. Any thoughts?
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Old 06-19-2013, 02:33 PM   #7
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You can sure try that and you are correct that it would verify if the slot is good or not... Highly un likely that the slot on the board is bad though. As others suggested the wire is being pinched somewhere by something. Continuing to replace the fuse or replacing with a larger fuse is only going to stress the wires even more and even lead to a possible fire.

Can you give us more details as to what is on the fuse? What are the items that aren't working?
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Old 06-19-2013, 02:42 PM   #8
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You can sure try that and you are correct that it would verify if the slot is good or not... Highly un likely that the slot on the board is bad though. As others suggested the wire is being pinched somewhere by something. Continuing to replace the fuse or replacing with a larger fuse is only going to stress the wires even more and even lead to a possible fire.

Can you give us more details as to what is on the fuse? What are the items that aren't working?
Sure, there are 4 lights in my livingroom slideout, one light over my kitchen counter, the range hood and i notices one light in the kids bedroom slideout
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Old 06-19-2013, 02:46 PM   #9
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Well I would have to say the most likely culprit would be the cabling running from the underside of the main camper to the slide where it hangs and is exposed. I have seen some where the wires are held out of the way with springs, maybe that rubbed through?

If it's not in the slides, I would try to find the wiring running to the kitchen area. It could possibly be a loose wire hanging in the range hood...

Do you have access to an ohm meter and know how to use one?
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Old 06-19-2013, 02:56 PM   #10
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I verified the exposed wiring under the slideout. Looks fine . However i found it strange that was able to pull the wiring coming from the main trailer passing theough the steel bars that support the slidout. As for the ohm meter, could always purchase one. Have a feeling it will be very userul in the futur.
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