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 > Having trouble locating short circuit

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trailerbikecamper

eastern Canada

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Posted: 05/14/19 05:13pm Link  |  Quote  |  Print  |  Notify Moderator

I have a 2004 Carriage Compass 30 RLS. Yesterday when I was leveling the camper, I blew a fuse, and all 12V power went off in the camper. The fuse is a 25A on a #10AWG black wire. I went back to the camper today with my multi-meter to find out what happened. Today, I found that everything that runs on 12V works, except one fantastic fan. The odd part is that, when I opened the fan it had two #14AWG wires. One was purple, the other white.

The powered cover for the fan is fine, but the fan doesn't run. Should I open the fan itself? Or look elsewhere to find the short. There is a 4A glass fuse in the fan, but this fuse is fine.

I have a second fantastic fan which works perfectly.

The 120V power is not plugged in


Dan

agesilaus

North Florida

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Posted: 05/14/19 05:19pm Link  |  Quote  |  Print  |  Notify Moderator

If you expect consistent wire color codes in an RV you are doomed to disappointment. So don't be surprised that there is no black wire obvious inside the fan housing. Use the ohmmeter function on the DMM to find out which of those wires is connected to the black one.


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trailerbikecamper

eastern Canada

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Posted: 05/14/19 05:24pm Link  |  Quote  |  Print  |  Notify Moderator

agesilaus wrote:

If you expect consistent wire color codes in an RV you are doomed to disappointment. So don't be surprised that there is no black wire obvious inside the fan housing. Use the ohmmeter function on the DMM to find out which of those wires is connected to the black one.


I was thinking this on the way home. I'll try this tomorrow. I was also thinking that the purple and white are for the raise/lower function and not for the fan itself.

BFL13

Victoria, BC

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Posted: 05/14/19 06:19pm Link  |  Quote  |  Print  |  Notify Moderator

Since the 12v power came back by itself, you must have blown a 12v self-setting circuit breaker instead of a fuse. Meanwhile your fan has another issue all by itself.

It should have its own fuse at the DC fuse panel besides that little one of its own.


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MrWizard

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Posted: 05/14/19 09:04pm Link  |  Quote  |  Print  |  Notify Moderator

that is NOT a Short

that is an interuppted missing connection

shorts blow fuses or melt wires


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eieioh

Washington Court House, Ohio

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Posted: 05/15/19 04:19am Link  |  Quote  |  Print  |  Notify Moderator

Better known as an intermittent open circuit. VERY frustrating to find.

trailerbikecamper

eastern Canada

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Posted: 05/15/19 03:23pm Link  |  Quote  |  Print  |  Notify Moderator

I think I may have had multiple issues. Both a tripped circuit breaker and a short. The black wire I am trying to trace has an inline 25A fuse. This fuse blows as soon as a new fuse is put in.

mchero

Henniker, NH

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Posted: 05/15/19 03:46pm Link  |  Quote  |  Print  |  Notify Moderator

mounting ANY hardware inside or outside? Running a screw in a wall or roof could hit wire(s).


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BFL13

Victoria, BC

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Posted: 05/15/19 04:01pm Link  |  Quote  |  Print  |  Notify Moderator

Can't think what would have a 25a fuse in your rig

https://www.gardnerrv.com/product/used-2004-carriage-compass-30rls-747537-5

The 2003 5er we had, used a 40a for the converter, a 30a for the slide, a 30a for the jacks. No 25 anywhere. Yours has that smaller bedroom slide ours didn't have--does it have its own fuse --25a? Assuming both electric.

In the OP it said "while levelling" so was it for the jacks? If still blown do the jacks work? Or is it no jacks, no one fan, but everything else works?

trailerbikecamper

eastern Canada

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Posted: 05/16/19 05:48pm Link  |  Quote  |  Print  |  Notify Moderator

OP here. Jacks work, everything else seems to work except the one fantastic fan, the cover raises but the fan doesn't run. All the lights, the jacks work fine, the other fan works. There is a connection for a powered awning, that was never used. I may have gotten water in the exterior connection? I haven't tried the furnace. I will give it a good shakedown this weekend.

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