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Old 06-30-2019, 08:35 AM   #1
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Blown Tongue Jack Fuse

I blow my tongue jack fuse virtually every time I tow. I have never blown it while raising or lowering the jack. I have searched the forum and haven't found information that is specific to my situation. Oftentimes, the fuse filament doesn't just break, but the whole fuse shatters (which is very challenging to extricate all of the pieces). And the last time I went to replace the fuse, it arced.

I took it to the dealer, and Airstream recommended to replace the entire tongue jack, which the dealer is doing now. My concern is that I am about to leave on a 4-month adventure, and it would really suck if the problem wasn't fixed. Manually cranking the jack is doable but not fun. I am concerned the problem is with the fuse assembly itself. Thoughts?

Thank you.
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Old 06-30-2019, 09:54 AM   #2
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Well, I just ereased my comments after re-reading your second sentence again.

"I have never blown it while raising or lowering the jack."

That needs explaining because unless you are raising or lowering then the jack isn't running. So is there a short between wire coming from the fuse and the main switch?
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Old 06-30-2019, 10:15 AM   #3
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I'd have to guess you have a dead short in the original jack.

You may also have a couple of gremlins riding on the tongue of your trailer while smashing your jack fuses with little hammers. Is the cable to your jack fuse long enough to prevent physical strain on the fuse itself?
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Old 06-30-2019, 10:48 AM   #4
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If the fuse arced while you were replacing it, there's another problem.
There should be no voltage flowing through the fuse unless the jack is moving.
The positive wire should run from the jack to the battery.
If it does, then it seems like the problem is inside the jack itself.
Broken fuses? That's a new one.
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Old 07-01-2019, 09:16 AM   #5
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Been through 3 jacks so far on my 2016 FC, each time replaced by warranty. I now carry 6 of the heavy duty slow blow fuses just in case!
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Old 07-01-2019, 09:52 AM   #6
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I'd look for a shiner or skin on the hot lead. It is possible that it would be clear of shorting to ground until you drive down the road, hit a bump, jar the wire, short to ground, pop the fuse. If the AS dealer changes your jack, make sure they change the wire too.
Happy camping.
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Old 07-01-2019, 01:31 PM   #7
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Thanks everyone. I just thought of another instance that was odd that might shine more light on the situation. One time I towed a few hundred miles, backed into a campsite, and then checked to see if the tongue jack would move. It did. I then backed onto a stack of levelers, which of course required some momentary torque from the engine. I then went to lower the tongue jack and the fuse was blown. How does that make sense? Could it be possible that the connection between the fuse and wire is loose/faulty?

I am good with most everything about camping. But electricity is my blind spot.
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Old 07-01-2019, 01:42 PM   #8
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I am afraid there are a lot of things that are possible at this point. The other posters who have suggested an intermittent short to ground, I think, are on point. Look at the wire coming out of the fuse holder, strapped to the jack post and see if you can see rubbed insulation. Unfortunately, it could be totally internal to the jack and you will never find it without taking the jack apart. With the fuse blowing as you described it, the short is most likely, not just a over-current. But, you are still in warranty, just take it to your dealer, describe the whole thing and he will first do a visual and then he should replace the jack if he does not see a bare wire from the fuse to the jack.
I just replaced my jack and the first one I bought had an internal failure so this is just typical RV quality stuff.
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Old 07-02-2019, 03:18 AM   #9
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All this mystery has me worried.

Another mystery — where would one find the jack's fuse?

I've never noticed it
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Old 07-02-2019, 03:44 AM   #10
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Quote:
Originally Posted by WhereStream View Post
All this mystery has me worried.

Another mystery — where would one find the jack's fuse?

I've never noticed it
See my post just above
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Old 07-02-2019, 04:03 AM   #11
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Quote:
Originally Posted by WhereStream View Post
All this mystery has me worried.

Another mystery — where would one find the jack's fuse?

I've never noticed it
Your owner's manual should indicate this. On p. 6-4 of our manual there is an illustration under the heading "Power Jack Fuse."

Good luck,

Peter
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Old 07-03-2019, 03:16 PM   #12
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So, I finally figured out what was causing my blown fuses and shorting. My Propride hitch shifted an inch or so laterally at some point in my travels, which caused the jack wire to be pinched when I made a tight turn to the right while towing. I did it enough times that the wire insulation became worn through. So, if I made a tight right turn while towing, the fuse would pop. If not, no blown fuse. Mystery solved.

Thanks again for your input. I hope this thread helps someone down the road.
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Old 07-04-2019, 06:48 AM   #13
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Thanks for reporting a conclusion.

Too many times it doesn’t happen and no one learns from the problem.
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Old 07-04-2019, 07:42 AM   #14
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Ditto . . . thanks for the update.

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Old 05-20-2020, 08:46 PM   #15
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Power Jack Blowing Fuses Constantly!

I'm reviving this older thread.

I just took delivery, during the pandemic, of a 2020 International Serenity. It was delivered to me by a dealer from out of state. When the trailer arrived the driver blew two fuses just getting the trailer off his truck. Since then, I have blown six more fuses getting the trailer to the place where we keep it. I've noted when working there has to be a deliberate pause before pressing the button to go in a different direction. I thought this might be a safety feature but it would seem to me there would be an electrical circuit that would disable the motor rather than blowing a fuse. Whatever it is, it's totally unacceptable. I've reviewed the User Manual but don't see anything specific to my issue. However, the manual does describe the procedure to replace the powerhead. Anyone else had a similar issue?
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Old 05-20-2020, 09:35 PM   #16
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Quote:
Originally Posted by Rpatrick16 View Post
I'm reviving this older thread.

I just took delivery, during the pandemic, of a 2020 International Serenity. It was delivered to me by a dealer from out of state. When the trailer arrived the driver blew two fuses just getting the trailer off his truck. Since then, I have blown six more fuses getting the trailer to the place where we keep it. I've noted when working there has to be a deliberate pause before pressing the button to go in a different direction. I thought this might be a safety feature but it would seem to me there would be an electrical circuit that would disable the motor rather than blowing a fuse. Whatever it is, it's totally unacceptable. I've reviewed the User Manual but don't see anything specific to my issue. However, the manual does describe the procedure to replace the powerhead. Anyone else had a similar issue?
This is a super easy fix. Allow me to help you not loose your mind or cool

Here’s the problem. Your ground is not good, this is causing you increase Amp draw. In other words you need to remove On of the three bolts holding your jack in place and remove some of the paint from around the hole. Then put the bolt back in place. That’s it! After you put the boot back in place you can pint over it if you like to protect the connection.

Hope this help....
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Old 05-21-2020, 05:38 AM   #17
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In other words you need to remove On of the three bolts holding your jack in place and remove some of the paint from around the hole. Then put the bolt back in place.....
Just a safety type suggestion, hook up to your TV or support tongue with a jack stand or floor jack before removing a bolt. I honestly don't know if you can do it w/o bending the jack post flange but can't hurt to add additional support. That could also allow for jack removal and more thorough grounding cleanup.

Good luck.

Gary
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