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Old 09-05-2018, 11:59 AM   #1
MJM-NY
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Unknown Battery Part

So i noticed this plastic part has broken off of the TT tongue. I'm not sure what it's called or it's function and looking for guidance on it. there is bare metal on the backside of it that touches the metal of the tongue. wires from the house battery run into this. See attached pics.

In addition since i'm talking about the battery, i've noticed that my in house stereo stays powered when the trailer is unplugged and in storage, i have to imagine this puts a drain on the battery and i've noticed that my battery does lose charge (it's brand new, btw). is there something i'm doing wrong?
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Old 09-05-2018, 12:09 PM   #2
Ken / Claudia
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I will take a guess that is a wire connector. There are auto reset breakers on the tongue, it could be that. I have not used the correct name but there purpose is to not trip and need a new fuse but to keep working say on the trailer brakes.
You need a battery disconnect switch installed to stop all draining of the battery, the radio is only 1, you have others. Even the factory battery cut off switches still have power to some trailer items in the off position.
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Old 09-05-2018, 12:12 PM   #3
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I'm fairly certain that is the circuit breaker for your 12v electrical system, looks like the mount broke. If it was mine, I'd consider replacing it, and improve on the electrical connectors tat the factory skimped out on with a more weatherproof connector.
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Old 09-05-2018, 12:15 PM   #4
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i would def like to upgrade to a cutoff, i believe i heard it's bad for these batteries to fully drain or even drain past 50%?? just google rv battery cutoffs?
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Old 09-05-2018, 12:20 PM   #5
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That is a resettable circuit breaker. The picture looks like the mounting tab has broken off. If your close to the selling dealer, it shouldnít take but about 1/2hr.

If your too far away or donít feel like spending the money on fuel for a $5.00 part, you can replace it yourself. Just make sure to match the rating (should be stamped on the breaker) and put the leads on the right posts, they are color coded so just match new with old.

Unless you have a battery disconnect, then you will have parasitic draws on the battery. Two choices: take the positive cable off the battery post, or install a disconnect on the positive lead. Installation will depend on type/brand but Iím sure there are numerous videos.
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Old 09-05-2018, 12:21 PM   #6
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A disconnect is a good idea but will not replace the function of the auto resetting breaker in the picture. They are available at auto and marine stores and are different amperage ratings. The amp rating should be stamped on the breaker. Be sure to disconnect battery before wrenching to prevent turning your wrench into a welding electrode.
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Old 09-05-2018, 12:27 PM   #7
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exactly what i needed, thanks all!!!
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Old 09-05-2018, 03:12 PM   #8
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Are we sure it's not a grounding stud for the negative (Black Cable)?
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Old 09-05-2018, 03:38 PM   #9
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Vernon, I kind of wondered that myself. I'd like to look under the little cover.
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Old 09-05-2018, 03:47 PM   #10
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This is what is under that cover.
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Old 09-05-2018, 04:23 PM   #11
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Yup, that's what's under the cover. It's a "auto-reset 12 VDC circuit breaker"... That's what's "under the cover" Here's what it looks like "with the cover".... About $5 at any RV parts store. Buy a new "red cover" if it doesn't come with one. Another $1, but well worth it. When you reinstall it (it looks like the screw and part of the mounting tab is shown in the first photo) don't tighten the screw too much or you'll crush the tab and it will break again.

Be sure to look carefully at how it's connected. There is a "hot side and a protected side" usually marked BATT and LOAD. Don't hook it up backwards, although it will still work, it doesn't protect the circuits if there are two or more in series. Usually, on Keystone RV's you'll find two mounted very close together. One for "main power" and one for the slides/jacks.
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Old 09-06-2018, 02:14 AM   #12
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Inquiring minds wanted to know....Thanks John and Bob.
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Old 09-06-2018, 07:55 AM   #13
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Quote:
Originally Posted by chuckster57 View Post
That is a resettable circuit breaker. The picture looks like the mounting tab has broken off. If your close to the selling dealer, it shouldnít take but about 1/2hr.

If your too far away or donít feel like spending the money on fuel for a $5.00 part, you can replace it yourself. Just make sure to match the rating (should be stamped on the breaker) and put the leads on the right posts, they are color coded so just match new with old.

Unless you have a battery disconnect, then you will have parasitic draws on the battery. Two choices: take the positive cable off the battery post, or install a disconnect on the positive lead. Installation will depend on type/brand but Iím sure there are numerous videos.
What he said.
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Old 09-13-2018, 10:50 AM   #14
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Power side is the copper looking screw and load side is silver.
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Old 09-13-2018, 11:40 AM   #15
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here is the backside of the breaker, i'm guessing this is a 30amp?
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Old 09-13-2018, 01:10 PM   #16
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If you donít install a cut off switch or remove the positive battery connector. I suggest you plug in the unit to an electric connection. If you donít have a 30amp connection available then get a 30amp to 110 adapter and plug into a 20 amp service if available. This will keep your battery charged via the onboard battery charger. If you disconnect your battery you can still remove it and get a battery maintainer at home. This will keep the battery fully charged all the time.
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Old 09-15-2018, 07:15 PM   #17
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Auto Reset Circuit Breaker

Yes, as others have stated, it is an auto reset circuit breaker. Someone stole my battery about 6 weeks ago and disconnected the battery by just cutting the cables. I had to install new cables - one of which was attached to one of these circuit breakers. (I didn't know what they were until I went to a RV parts shop and inquired.) The cable had corrosion fused to the breaker stud, so I ended up destroying and had to install new ones. I found out:
1) Some are resettable, some are auto reset. The ones on our trailer were auto reset.
2) There were two on our trailer - and they are different values protecting different portions of the trailer.
3) To make reasseble more reliable, I take pictures of everything with my phone as I dissassemble and reinstall in reverse.

Learning something new every day owning a trailer.

To prevent or hinder future thieves, I fabbed up and welded a lockable "cage" to the battery frame.
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Old 09-17-2018, 09:43 AM   #18
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When I stored in a storage lot I used one of these. http://www.statetrailer.com/products...00&detail=true
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