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Old 03-03-2010, 10:14 PM   #1
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2007 25' Safari FB SE
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Electric Jack goes dead on and off

I have an '07 Safari. Recently, the tongue jack will stop working after a few seconds of operation. It just goes dead. If I let it sit for about a minute, it begins working again. This has just started. It acts as if it is overheating but the cap stays cool and I am doing nothing different than I ever have.

Any ideas?

Thanks,

John
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Old 03-03-2010, 10:22 PM   #2
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I have an '07 Safari. Recently, the tongue jack will stop working after a few seconds of operation. It just goes dead. If I let it sit for about a minute, it begins working again. This has just started. It acts as if it is overheating but the cap stays cool and I am doing nothing different than I ever have.

Any ideas?

Thanks,

John
John.

Sounds like a 12 volt circuit breaker is kicking out.

Either that breaker is bad, or, the jack is pulling too much current, which in turn, will make the circuit breaker kick out.

The easiest way to find out, is to place an ampere meter in the circuit, and see what it says when the jack is running.

Andy
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Old 03-03-2010, 10:34 PM   #3
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Just a guess, but examine the 12 volt wiring that runs to the battery. It may be severely pinched between the frame and LP cover. Over time, some of the strands may break which will limit the amount of juice available to the jack. This is not an unusual occurrence. Hope this helps.
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Old 03-04-2010, 09:16 AM   #4
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Thanks, guys. I checked the wiring and it appears OK. We are headed out of town this AM and will stop at the shop to have it checked out. I'll let you all know what the problem is/was when I get back next week.

JOhn
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Old 03-04-2010, 01:34 PM   #5
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Some electric motors have a thermal switch, which cuts out if the motor overheats -- a possibility. Is the battery fully charged? If the motor starts to run slowly just before it quits, the battery might be run down...
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Old 03-04-2010, 03:47 PM   #6
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Is the jack head loose or move when you hit the switch?. If the head is moving the jack could be loosing its' ground. There should be some set screws that can be tightened where head is on tube. Just a thought
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Old 03-04-2010, 04:08 PM   #7
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I had the same problem on an 06 Bambi a year and a half ago. Stopped in Wyoming to have a new jack installed. Turned out the connection from the battery to the jack was caroded big time. They cleaned it up and vola, the jack was as good as new and $300. plus cheaper.
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Old 03-04-2010, 04:29 PM   #8
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check grounding first

John,
I have had an intermittent operation of my tongue jack, too. And, dramatically, it threw a bright spark a foot into the air one of those times. I'd heard the first thing to check with 12vdc system intermittents was the ground connection.

Sure enough, the three bolts were loose in the flange connecting the jack to the tongue. I tightened these and have had no problems in the ensuing five months.

Good luck,

Jim
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Old 03-04-2010, 05:29 PM   #9
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Andy:
Does Inland RV sell those circuit breakers that reset themselves?
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Old 03-04-2010, 06:11 PM   #10
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Andy:
Does Inland RV sell those circuit breakers that reset themselves?
Yes.

They are available in ampere ratings.

Andy
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Old 03-05-2010, 09:43 AM   #11
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Thanks, everybody. I will check that all out this AM.

Andy, is the breaker located under the bed with the converter?

John
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Old 03-05-2010, 10:05 AM   #12
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My last SOB trailer had an electric tongue jack with a faulty circuit breaker. Replaced it and it worked great after that.
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Old 03-05-2010, 10:27 AM   #13
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When we purchase our AS the electric jack was missing. There had been a new fridge put in and some AH wired the fridge direct to the batteries and not too a breaker or fuse.To remedy this situation I did some wire rerouting. In searching the fuse and breaker panel I came across the wire for the jack. I traced it back and found the reason for the jack being replaced with a manual was a DEAD BREAKER. I went to my local Fruehuf Semi-Trailer dealer and purchased the correct breaker. Semi-trailers use the same thing in lite circuits.
Unfortunately I was not able to contact the PO to find out what he did with a probably good jack.
Those breakers will also GO SOFT is what I call it and will not carry a load. So check for grounding and broken or frayed wires and then a bad breaker.
GOOD LUCK
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Old 03-05-2010, 10:33 AM   #14
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Thanks, everybody. I will check that all out this AM.

Andy, is the breaker located under the bed with the converter?

John
John.

I don't have a manual for your model.

However, usually, the circuit breakers are very close to the Univolt.

Andy
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