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Old 04-25-2016, 03:06 PM   #11
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Originally Posted by DanNJanice View Post
It will be interesting to hear the results of your test. Assuming we are all talking about tongue jack fuses (and not some other fuse) the jack should not work, no matter what, if the fuse is blown. If it does work (and it really is the tongue jack fuse that is blown) then it must be wired wrong.
I share your skepticism and your interest in this. It seems bizarre, at best, if the fuse only protects the jack when powered from the TT battery. But I did not make this up; someone on the JOF reported that is what they found and my reaction was much like yours: A fuse to protect the jack that is dependent on which 12v power source is used? That seems unlikely.

What I do know is what I stated earlier (expanded a bit): When I brought the TT home and parked it next to the house, I used the power jack to connect and disconnect. Both of those times (like I always do) I was plugged in to my TV to minimize the load on the TT battery. Then I moved my TV to my driveway. Days later, I tried to level the TT, but the jack didn't move. I checked the jack fuse and it was blown. Sadly, there is no way to know when the fuse blew. I replaced the jack fuse and used the jack with the TT battery to level the TT.

Next: I need to remove the good jack fuse and try to duplicate the conditions - jack won't operate from the TT battery but does operate from the TV power.
Also: Is what I call the 'jack fuse' actually dedicated to the jack? I know it is the fuse that blows when I extended the jack too far, but does anything else loose power when that fuse blows?
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Old 04-25-2016, 04:36 PM   #12
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Originally Posted by oldmanAZ View Post
I share your skepticism and your interest in this. It seems bizarre, at best, if the fuse only protects the jack when powered from the TT battery. But I did not make this up; someone on the JOF reported that is what they found and my reaction was much like yours: A fuse to protect the jack that is dependent on which 12v power source is used? That seems unlikely.

What I do know is what I stated earlier (expanded a bit): When I brought the TT home and parked it next to the house, I used the power jack to connect and disconnect. Both of those times (like I always do) I was plugged in to my TV to minimize the load on the TT battery. Then I moved my TV to my driveway. Days later, I tried to level the TT, but the jack didn't move. I checked the jack fuse and it was blown. Sadly, there is no way to know when the fuse blew. I replaced the jack fuse and used the jack with the TT battery to level the TT.

Next: I need to remove the good jack fuse and try to duplicate the conditions - jack won't operate from the TT battery but does operate from the TV power.
Also: Is what I call the 'jack fuse' actually dedicated to the jack? I know it is the fuse that blows when I extended the jack too far, but does anything else loose power when that fuse blows?
We have the same trailer, so I would assume they are wired the same. However, I have done a fair bit of modification to the battery box on mine. If I remember correctly mine has an in-line fuse to the jack. It also has a self resetting breaker up under the front, by the electrical box, but that is not related to the jack. The jack is wired directly to the battery with the inline fuse for protection. It would not matter what was actually supplying power, as long as 12VDC was available at the battery terminals, the jack would work.
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Old 04-26-2016, 12:53 PM   #13
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The fuse is not protecting the jack, it's protecting the main lead off of the battery. When you're hooked to the tow vehicle, you're (approximately) splitting the load from the power jack between the trailer battery and the vehicle battery. When the TV is disconnected, the full draw is from the trailer battery (and through that 30a fuse). It does make sense when you think of it that way.
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Old 04-26-2016, 01:58 PM   #14
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The fuse is not protecting the jack, it's protecting the main lead off of the battery. When you're hooked to the tow vehicle, you're (approximately) splitting the load from the power jack between the trailer battery and the vehicle battery. When the TV is disconnected, the full draw is from the trailer battery (and through that 30a fuse). It does make sense when you think of it that way.
Assuming you are replying to my post, ignore this message if you are not. One of the issues in this thread is there is a lot of talking about fuses/breakers but it becomes unclear which fuse is being discussed. In my case I was specifically discussing the fuse that my trailer has inline with the jack. "Where" the power is supplied from makes no difference to that fuse, all power must flow through it to run the jack. So if that fuse is blown the jack still would not work, no matter what.

If you are referring to a fuse between the batteries and the trailer/convertor (and the fuse is good), then yes, the current would be split between the tow vehicle and the trailer batteries by some percentage. If this fuse were blown, there would be no 12V lights in the trailer unless plugged into shore power, the batteries would not charge from shore power, and the jack would not work unless plugged into the tow vehicle.
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Old 04-28-2016, 06:56 PM   #15
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I originally posted this thread . . .

In our case, we tried to hand crank the jack and it wouldn't budge so I tried a 50 amp fuse and it worked.

The TT was still plugged into the TV, so I would suppose that means it could not run off of that either.

We finally got unhitched and the TT has been in storage since. Richardsons RV in Menifee has not returned either of my calls.

We did blow one 50 amp fuse but had another. THis does not seem to be a good solution but I am in fear of not being able to unhitch on the road.

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Old 04-28-2016, 07:03 PM   #16
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We did blow one 50 amp fuse but had another. THis does not seem to be a good solution but I am in fear of not being able to unhitch on the road........Kathleen.

You always can unhitch; your TV should have a jack on board. Smile!
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Old 04-29-2016, 01:31 PM   #17
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There is a good answer to your suggestion about keeping a jack on board but it would involve a very long explanation revolving around the deductive reasoning and mechanical skills of the more masculine side of our little camping team. More plainly stated, and for reasons that I cannot fathom, the "big guy" tends to "store" 100% of the tools; equipment; gear; etc in all sorts of cubbies, most of which are in our garage. I gather what I can for each trip but am becoming very adept at kitbashing all sorts of repairs. Fortunately, he has offsetting traits that make our life journey together well worth it.

As for the person who asked which fuse . . . there is a cleverly hidden fuse inside the battery case . . I assume it is the inline fuse that someone else was mentioning. I will try Richardson's one more time and will post the solution (if there is one).

Thanks for all your suggestions.

Kathleen
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Old 04-29-2016, 02:28 PM   #18
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I originally posted this thread . . .

In our case, we tried to hand crank the jack and it wouldn't budge so I tried a 50 amp fuse and it worked.

The TT was still plugged into the TV, so I would suppose that means it could not run off of that either.

We finally got unhitched and the TT has been in storage since. Richardsons RV in Menifee has not returned either of my calls.

We did blow one 50 amp fuse but had another. THis does not seem to be a good solution but I am in fear of not being able to unhitch on the road.

Kathleen
Now that you have the trailer unhooked, is it still hard/impossible to move the jack with the handle? If so, it should not be, and I would get it replaced.
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