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Old 06-29-2016, 09:22 AM   #11
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I fully retract my electric jack when I'm through with it after hitching up. I have done this for years and never blown a fuse. Can someone explain the difference between my situation and at the OP's?
I would guess that (like me) you let go of the button as soon as the jack motor loads up. Rather than waiting for the no noise of the motor being completely jammed.
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Old 06-29-2016, 09:26 AM   #12
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I would guess that (like me) you let go of the button as soon as the jack motor loads up. Rather than waiting for the no noise of the motor being completely jammed.
Absolutely. Same when operating the slides. DW thinks I'm too touchy when she lets the slide "bump" a few times. Nice to know my concern is justified.
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Old 06-29-2016, 12:23 PM   #13
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I took a Sharpie and drew lines around my jack post about 1/4" from maximum extend and maximum retract and don't let the motor get loaded enough to blow the fuse.
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Old 06-29-2016, 12:45 PM   #14
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I've never blown a fuse by holding the button too long. I've always let the slides "tick" a few times before letting go of the button and have never had a problem. The jack on the other hand, I've never drawn that all the way up. Interesting though..
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Old 06-29-2016, 01:34 PM   #15
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I've never blown a fuse by holding the button too long. I've always let the slides "tick" a few times before letting go of the button and have never had a problem. The jack on the other hand, I've never drawn that all the way up. Interesting though..
Yeah, the slides have a clutch to avoid overloading the motor. The tick-tick-tick you hear is the clutch operating to avoid tearing apart the slide mechanism.

The jacks need to have 100% of the motor power available to overcome and unknown tongue weight.

The 30A fuse prevents the fire that will occur if the jack motor is jammed for more than a handful of seconds.

It's still good practice to listen to the motor/gear-train and let go of the button as soon as you hear something different/odd occurring. It will add quite a bit of service life to your automated possessions.
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Old 06-29-2016, 02:45 PM   #16
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It is usually not recommended to run a jack screw all the way to either end. Aside from the blown fuse issue, it destroys the nut, which is often bronze or a soft metal of some other origin. Someday, you'll find your jack .... won't.
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Old 06-29-2016, 03:49 PM   #17
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You can purchase slow-blow fuses at most any auto supply.


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Old 06-29-2016, 04:55 PM   #18
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You can purchase slow-blow fuses at most any auto supply.


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Depends what type of fuse you need. My Barker jack uses the old glass style fuse, 30 Amp MDL® Fuse which is a slow blow. I tried all the local auto parts stores, Lowes/Depot, I even tried the local RV dealer and he didn't have them. Only a few places online had them, DelCity.com has them in ten packs for $4.50
From what I saw nobody makes a slow blow fuse to fit ATC/ATM which is what most of the inline fuses are.
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Old 06-29-2016, 05:04 PM   #19
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Slow blow blade type fuses available here -

Slow Blow Blade Fuse
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Old 06-29-2016, 05:10 PM   #20
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I am looking at a new 4500 pound tongue jack that has safe stop which wont allow it to bind or blow a fuse like the one on the tt now and I think that's a good idea
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