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Old 04-17-2018, 02:54 PM   #1
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Mystery of blowing fuse resolved

The 15 amp fuse that protects the interior lights and exterior porch light along with the light under the steps of my 2017 265RLSW would blow intermittently. Completely driving me crazy because it was not a constant fault. Difficult to impossible to troubleshoot a potential short when the fuse was not blowing. Isolated it on a camping trip to the porch and step light; flip on the outside lights, fuse blows taking out living area lights as well. Kept the outside lights off for the trip and when I got the trailer home, no more blowing of the fuse and the outside lights worked perfectly.

Made a trip to Disney, no blowing of the fuse, bring the trailer home and finally the fuse blows at the house where I can isolate it. I’m careful not to disturb any wires while figuring this out; certainly don’t want the fault to go away. With the light switch off, I disconnect the connectors at the step light and read resistance between the wires supplying the power and return and perfect, I have a dead short. I follow the green 12VDC wire back and it was running under the bracket on the side of the fresh water tank. I remove the bracket and the wire is squeezed flat and right where it came out from under the bracket I saw exposed copper. Finally I had found the interment short.

Looking closely at the exposed copper, several strands were broken so I cut out the damaged area and put an inline splice, soldered it up, slid some heat shrink tube over it and problem solved. All the lights work, no more blowing fuses and the short is resolved. The bracket is not a support for the water tank but rather a positioning bracket to keep the tank from sliding around. Obviously I reinstalled the bracket without the wire running under it and to the side where all the other wires are running.

Just figured I would pass this discovery on in case someone else was battling with something similar. Wouldn’t be a bad idea to roll around under your trailer and look to make sure you don’t have any wires pinched between a bracket and the frame. Other discovery’s were wires running through bare holes in the frame, I use a small piece of heater hose, split it down the side and zip tie it so the wire insulation is not rubbing on the metal hole. It would probably take years of travel vibration to wear through the wire insulation but nothing wrong with some homemade grommets. The picture of the bracket is after the repair.
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Old 04-17-2018, 02:57 PM   #2
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Nice detective work! Thanks for sharing your findings.
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Old 04-17-2018, 03:25 PM   #3
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X2 on detective work! Sometimes ya just have to start at the beginning and trace it till the problem is resolved.
Bet you felt great when you found it!
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Old 04-17-2018, 05:23 PM   #4
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Nice detective work! Thanks for sharing your findings.
3X! Thanks for the post.
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Old 04-18-2018, 05:25 AM   #5
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Good find and repair.
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Old 04-18-2018, 06:00 AM   #6
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That is fantastic that you found it. Can I get some input on our camper electrical noise? we have not camped in our new to us octane T26Y yet but we have been working on it to improve a few things. There is a crazy high pitch fan type noise coming from the fuse box. All we have been able to deatermine is that it NOT the fan. It is a really annoying high pitch!
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Old 04-18-2018, 06:50 AM   #7
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Good job! Based on my experience, it's best to send the kids and wife away when trying to trace out a short under the trailer. When I was under my new trailer checking for holes that needed sealing, I took the time to install split tubing around any wires that ran through or over the steel framing.
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Old 04-18-2018, 07:43 AM   #8
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This is a great post, thanks. My electronics teacher from over 50 years ago always taught us to start right at the beginning. A lesson that has helped me many times over the years.
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Old 04-18-2018, 12:10 PM   #9
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Quote:
Originally Posted by Victoria View Post
That is fantastic that you found it. Can I get some input on our camper electrical noise? we have not camped in our new to us octane T26Y yet but we have been working on it to improve a few things. There is a crazy high pitch fan type noise coming from the fuse box. All we have been able to deatermine is that it NOT the fan. It is a really annoying high pitch!
My first guess would have been fan bearings but you say youíve ruled that out. In the Navy on our ships the large transformers produced a high pitch noise but to be honest I have never heard a small 60hz 120VAC transformer make much if any noise. There is a transformer in your power converter that steps down the 120VAC and then sends it through a bridge rectifier to provide the DC voltages the camper uses. If youíre certain it is coming from the converter/power distribution unit it is pretty much a remove and replace module.

I would go camping. Utilizing all systems on a camping trip, the problem may work itself out. No telling how long the camper has been sitting up if you just bought it and Iím assuming by you saying new to us it was used and no warranty is applied.

Before I bought a new power converter I would rule out all other possible sources of electrical noise. Might try turning off each of the 120VAC breakers that supply the systems one at a time to see if the noise changes. You can do the same isolation with the fuses too just make sure you secure power to the trailer and disconnect the negative battery cable before pulling or installing fuses. If the noise is still present with breakers off except main feed breaker and fuses removed I would look at replacing the converter module. This is just a rough guess since I havenít actually heard the noise youíre describing. Good luck to you.
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Old 04-18-2018, 01:57 PM   #10
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Murphy always taught me that it doesn't matter where you start, you will find the problem at the last place you look



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This is a great post, thanks. My electronics teacher from over 50 years ago always taught us to start right at the beginning. A lesson that has helped me many times over the years.
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