Bad Casita Porch light - Page 2 - Fiberglass RV


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Old 03-17-2003, 10:14 AM   #15
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Bad Casita Porch light

It's getting even more interesting. The fuse WAS blowing within hours of a rain previously which is no longer the case since I replaced the lamp and caulked in the switch, lens, etc.. Now the fuse blows whenever I tow!! I've had it work for days/week now in some very violent storms and I've not had a problem with it but when I tow, it is blown by the first stop. I replaced the fuse yesterday after it blew and it was blown by the next stop. I have nothing running on the circuit when I'm driving. Anyone have any advice short of rewiring?

Pete,
I was definitly blowing a fuse within 12 hours of rain (this happened 4 times when the trailer was parked) and since I replaced and caulked the switch etc. on the light I no longer have that problem.


Thanks.
Bill
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Old 03-17-2003, 01:30 PM   #16
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fuses blowing

Bill:

I think it's unlikely the trouble is in the run of wire. There would have to be an intermittant short occuring between the hot wire of that circuit and a ground wire. Unless the hot wire is shorting where it goes thru the hole in the converter housing, should be a plastic protector in the hole.

But perhaps in the connection of the wires to the: 1. porch light, 2. entry light, 3. fridge.

Or more likely something loose within one of these 'things'.

Have you looked at the pigtail connection, switch and socket, of the entry light?

And you really don't want to remove the porch light again, right (but it's suspicious)?!

That leaves the fridge. You could remove the hot wire at the fridge terminal block, tape it up, and see if it makes any difference.
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Old 03-17-2003, 01:35 PM   #17
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Bill. Sorry for your continued problems.

As I said in the beginning, however, I doubted (since you said you replaced the light and continued to have problems) that it was the light.

You have to have a short somewhere along the pink wire line (since that's the fuse that is blowing).

It's possible that the wire covering is worn ... or pierced ... somewhere along the run from the fuse to the refrigerator ... to the lights.

You should be able to "visually" inspect the pink wire along most of its run ... by removing the benches, etc. Check for something metal, rubbing or piercing the wire. The metal would have to also "ground" the hot wire to the frame or somewhere, to cause the wire fuse to blow.

After the refrigerator, the wire running up along inside the exterior refrigerator cabinet. It's almost impossible to visually inspect this part ... but, if I were you, if you've inspected the entire wire up to that point, I'd disconnect (or clip) the hot wire after the refrigerator ... to see if the "short" is hidden up inside or underneath the carpet on the run to the light.

The only way I can conceive "towing" aggrevating the "short" ciruit is if the "rub" or "pierce" makes a temporary connection due to movement as you tow.

The same fuse blows each time, correct?

Have you tried moving the wire over to an empty circuit on the converter (you'd have to move the fuse too) ... to see if the short follows you to the new location?
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Old 03-17-2003, 01:40 PM   #18
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>>pigtail

Don, I thought about asking him about the pigtail ... because a "wire melt" in the pigtail is the cause of a lot of hidden electrical problems.

Had his short occured only when he was hooked to the tow vehicle, I'd say try replacing the entire pigtail.

But he says the blown fuse is always in the refrigerator/porch light circuit ... first when he wasn't towing and now when he's towing.
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Old 03-17-2003, 01:44 PM   #19
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Also possible something in the refrigerator itself is going bad, and shorting out the system.

But the blown fuse was occuring when the refrigerator was turned "off" originally, right?

When you have everything removed to inspect the wiring, you could always take the opportunity to install a "dedicated" wire for just the refrigerator.

And isolate the two lights onto a different circuit.

That wouldn't be too hard to do.

Also give you a chance to run a heavier wire for just the fridge.
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Old 03-17-2003, 01:58 PM   #20
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fuses blowing

Bill:

To follow Charles idea of disconnecting the wiring to the porch and entry lights:

There's a splice connector under the bench next to the fridge. That's where the wire from the fridge and the wire from the porch/entry lights connect to the hot (pink) wire that goes around to the fuse terminal. Doesn't quite show up in this photo, but this is the area. Anyway you could temporarily 'unsplice it' here. It'd be hard to reach, however, without removing the bench.

<img src=http://www.fiberglassrv.com/board/uploads/3e762660773f9Casita fridge wiring under bench.jpg/>

FWIW, There's another splice connection (both hot and ground wires) under the carpet, in the upper cabinet. There's a hot and ground getting together somewhere, but where?!
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Old 03-17-2003, 02:08 PM   #21
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Thanks for the photo help, Don!

I think it's time he remove the benches ... to check for a rub or something metal puncturing the wire.

Something could have overheated the wires and a hot and ground partially melted together ... that would "jiggle" together going down the road.
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Old 03-17-2003, 04:46 PM   #22
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Fuse

Wow you guys are fast! The fridge was off (12v), it works fine on 12v though (I've tested it parked). The fuse that blows is always the hallway, porch and fridge circuit. I've gone through 7 fuses, 3 of those were with the old porch light before/after a couple cleanings (happened after a rain, parked), 2 more of them were after I installed the new porch light and during a variety of applications of caulk (parked), and the final 2 happened going and coming back from my weekend destination. I'm convinced that the first 5 were the result of rain because they happened very shortly after it rained and it would work for days/week up until then. The fuse has worked while parked for weeks now through some really nasty torrential rains since I did a more extensive caulking job on the new light and switch. The week after next I'll be hitting the road again and I'll disconnect the fridge and try that, if I still get a short I'll probably replace the circuit for the lights (adding a new fridge coil fan on the circuit) and run a dedicated line for the fridge at the same time. I'll look into moving the wires to a new circuit on the fuse panel and possibly might do that if the fuse blows with the fridge offline. I'll post my findings!

Thanks
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Old 03-17-2003, 06:31 PM   #23
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When you set up the new circuilts (best way around that sort of problem, BTW IMHO), check to see whether the converter's fuse panel has some fuses set up as "filtered"; you don't want to be hooking up anything with a motor to that part or they may no longer be filtered. The filtered fuses are for stuff like TV and radio so there is the least amount of electrical noise.

Pete and Rats
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Old 05-07-2003, 01:16 PM   #24
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Update

I went on a long road trip and was able to do some testing. I rewired the fridge so it is now on it's own circuit and it works fine, the old fuse however still blew when I towed. I then disconected both light fixtures and the fuse blew again, I then I moved the line to another fuse spot and it blew again, so there is definitly something wrong in the wiring. I'll rewire (I already ran more wire most of the way when I did the fridge) the two light fixture and add my fridge cooling fan to this circuit.
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Old 05-07-2003, 02:00 PM   #25
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wiring

Bill:

FWIW, Here's another connection/splice in the wiring to the lights.

<img src=http://www.fiberglassrv.com/board/uploads/3eb9576e0ed49Casita wiring by the fridge 1.jpg/>
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