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Old 04-12-2016, 11:48 AM   #11
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It's more than likely a blown 30amp fuse

There's a fuse that blows when the jack operates overloaded. It will still work when connected to TV, but not off the trailer battery.
Look for an in line 30amp fuse towards the battery. Mine was hidden under a seat.

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Old 04-12-2016, 01:29 PM   #12
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Originally Posted by linkbeat View Post
Actually it will work when plugged into the truck with the fuse blown, I discovered this recently. Apparently there's a separate connection?

I had this same problem, it was a blown fuse. If you raise the jack beyond the top, the fuse will intentionally blow to prevent damage.
I have blown the tongue jack fuse once or twice, but I changed the fuse; not the power source. I don't recall if I was connected to the TV or not. But, IMO, it seems odd that a fuse designed to prevent damage to the jack from over extending, would be depend on the power source.

I haven't blown that fuse in a long time, but the next time it happens, FIRST I will try switching the power source, not the fuse.

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Old 04-12-2016, 08:43 PM   #13
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I would say your battery is weak on the trailer check your ground like said above use the star washer between the Jack base and trailer frame. My jack is wired with one positive wire that runs to the battery and a inline fuse I replaced my fuse with one size larger and keep spares cranking with the emergency handle is a pa in especilly when using the Jack to set wd bars I have a super jack Barker vip 3500 with 24" stroke that unit worth the money very good
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Old 04-24-2016, 12:41 PM   #14
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Power Jack Problems

My 2015 power jack has continually had issues with blowing the fuse, but we just used the power from the truck. I was told that this can be a problem since the jack isn't supposed to be totally up or down using the power? Anyway I had it worked on over the winter and it was working when I left the shop but yesterday I moved it out of storage and not only did the fuse blow, but now I can't even get it to work off the truck power. The jack was covered so no water. The work down on it put another circuit and fuse in the line and I was told that if it freezes, just lay off the switch and it will reset. The new line has a 40amp fuse in it. Well none of it works now.
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Old 04-24-2016, 02:32 PM   #15
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Most all of the PTJ are not weather proof and love to have an extra rain cap on them. Like a bucket.
Those PTJ are simple to disassemble and do need preventive maintenance. Some have the fuse at the battery and some have a circuit breaker inside the unit. They are usually 30 Amp.
A 3500 lbs. PTJ will lift an half ton with ease. The switches are an easy target for moist which can create corrosion. Spray some WD40 or silicone spray in them.
If the PTJ is to tight against the tailgate when down, some can be turned a 90 and most of them 180 degrees.
Some use the chassis as ground and will fail often. Install a #10 ground directly between the motor and batt. minus.
If they seize up it is usual water in the gearbox and motor. Even if you buy brand new out the box they need a cover and pre-maintenance.
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Old 04-25-2016, 08:53 AM   #16
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Does Jayco use Atwood power jacks? I hate the idea of a 5 gallon bucket thrown over the thing..

I wonder if this would fit?
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Old 04-25-2016, 08:58 AM   #17
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When you guys say it blows fuses, are you guys talking about the breaker inside of the box? I looked for a use on mine and couldn't find it. Replaced the breaker just be safe and it PTJ works with 120V but not with 12V.
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Old 04-25-2016, 09:59 AM   #18
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I agree with the blown fuse theory. I know that is what it was for me, two weeks after I took delivery. My fuse was along the wire route from the tongue to the trailer. Just trace the wire from the plug and follow it back to the trailer, the tiny fuse box was there. Mine was on the passenger side.

I think it was a 30amp fuse that was blown.

No problems since that time.

Mine also worked only while connected to the truck. But once I replaced the fuse, no problems.

I read somewhere if you overextend past a certain point while raising your jack, it will cause the fuse to blow. There is a demarcation line on the leg of the tongue if you look closely.

Hope this helps.
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Old 04-25-2016, 07:37 PM   #19
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We have a 2016 Jay Flight 27RLS and ours only works when it is plugged into the truck or electric is plugged into outlet. My husband looked and the fuse was blown. We replaced fuse and it blew again.

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