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Old 11-03-2018, 04:13 PM   #1
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Old Problem Back Again

Earlier this year I had a lengthy post about my 12 Volt, 15 AMP DC fuse blowing whenever I applied DC or AC power to the rig. The interesting thing is it only happened when it was cold. I know, strange! The 15 AMP fuse fed both my living room slide (with the fridge) and my dining room slide so when it blew I lost everything in both slides. Trying to trouble shoot I separated the wiring so each slide was on it own fuse. Well today is was mid 40's and the fuse for the now separated dining room blew. I replaced it a few times but no go. Good news is it isn't the slide with the fridge. As far as I can tell I only loose the three lights in the dining room. If it acts as it has in the past I can replace the fuse when it gets warmer but it will blow when it gets cold overnight. No problems being out a few months this summer. I wanted opinions if I could wire in a resettable circuit breaker so I can troubleshoot this without spending my Social Security on 15 AMP fuses? This is not going to be easy to find. I was thinking of something like this:

https://www.ebay.com/itm/CB41220-Sie...QTM:rk:26:pf:0


If there is something else I might do I would appreciate any input.
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Old 11-04-2018, 09:38 AM   #2
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Something that only happens when it gets cold and then to the slides I would lean toward looking at the type of lube used no the slide rails and gear box. could the lube be stiffing up in the cold and overloading the motor? This is a WAG on my part.
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Old 11-04-2018, 09:48 AM   #3
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Are you trying to bring the slide in or out when the fuse blows? Or does this just seem to happen when it gets cold without trying to move the slides? I would try removing all power from the unit at least the AC and then remove the DC wire from the fuse and use a multimeter to test the wires going to the problem slide. It sounds like you may have a light short to ground in this circuit that is a problem when cold and wire or whatever shrinks or shortens slightly.
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Old 11-04-2018, 10:18 AM   #4
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No slide Movement

To answer a couple of questions. This happens AS Soon as I apply either AC or DC. No slide movement involved. Agree it must be a short to ground. As I stated the only thing so far I see that is effect is the three LED lights on two separate switches in the slide. The radio has it's own fuse. I did check the TV amplifier and expected it not to work but it is working, so some 12V is getting into the slide. Don't know which fuse controls the amplifier as of yet and do not think that is really important. I am going to a warmer climate for this week so will look around. I did remember last night that we spent a week at the Grand Canyon a few weeks ago and it was way colder than it is here at home and I had no issues. I will replace the fuse later today and see what happens. Temp forecasted at 82 degrees at the campground.

I still want something to replace the fuse while troubleshooting.

Thanks for the assist
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Old 11-04-2018, 10:23 AM   #5
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Interesting problem. Possibly due to expansion and contraction causing a short or a bad component in one of the light modules if they are LED. Be sure to let us know what you find. In the mean time why not try something like this;



https://www.amazon.com/HOUTBY-Circui...ble+blade+fuse
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Old 11-04-2018, 11:02 AM   #6
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Great

Thanks FlyBob, that looks great. I will keep you all posted.
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Old 11-04-2018, 04:22 PM   #7
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[QUOTE=Flybob;1965018]Interesting problem. Possibly due to expansion and contraction causing a short or a bad component in one of the light modules if they are LED. Be sure to let us know what you find. In the mean time why not try something like this;



I agree with Flybob.
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Old 11-04-2018, 04:57 PM   #8
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PSU Turff, Try something like what? There was nothing there. If you guys think it might be a bad LED light module I might try to take those down and inspect them.

As I thought, I got down to Phoenix, set up camp and put a fuse in and all is well so that leads me believe it is not a bad light. Could a bad light module cause the fuse to blow when it is cold outside?

Temps going down to mid to high fifties tonight so I doubt it will blow. We will see.

Thanks
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Old 11-04-2018, 05:30 PM   #9
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I just recently had a intermittent fuse blowing. Found a wire that was wrapped around a bolt under bedroom slide and had rubbed through the insulation. It was a small mark in the wire and movement (from just normal walking) caused the wire to intermittently make contact and blow the fuse. Look for how the wiring is running to those lights, it may be a simple fix like mine but difficult to isolate.
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Old 11-04-2018, 05:33 PM   #10
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Quote:
Originally Posted by Davidceder View Post
PSU Turff, Try something like what? There was nothing there. If you guys think it might be a bad LED light module I might try to take those down and inspect them.

As I thought, I got down to Phoenix, set up camp and put a fuse in and all is well so that leads me believe it is not a bad light. Could a bad light module cause the fuse to blow when it is cold outside?

Temps going down to mid to high fifties tonight so I doubt it will blow. We will see.

Thanks
do you have tank heaters as part of your pkg? the thermal switch could be bad or weak, some are 12 volt.
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