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Old 01-11-2013, 12:36 AM   #1
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I just put this on the new camper....So now I'll ask....Anyone had any luck with this style disconnect? A friend had one on his Chevelle and it always worked well.
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Old 01-11-2013, 12:56 AM   #2
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I have seen these used on classic cars with a lot of luck.
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Old 01-11-2013, 03:51 AM   #3
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JK
I put one of these on my unit and it works very well. For the price you cannot go wrong.

Where abouts in AR are you? I lived there years ago.

Jim
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Old 01-11-2013, 09:03 AM   #4
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Were close to Pocahontas. In the northeast corner.
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Old 01-12-2013, 12:14 AM   #5
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JK,
We lived in Springdale, just north of Fayetteville. Hope the disconnect works for you. Are you charging the battery in your picture?

Jim
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Old 01-12-2013, 03:52 AM   #6
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I have tried 3 of them from Harbor Frieght and all were defective. I would loosen the disconnect knob and kill the power only to check back later and find that it was back drawing juice. I understand that the more expensive ones from your auto parts stores are better made and do work well. JMHO
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Old 01-12-2013, 04:33 AM   #7
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I agree with you Bruce. I have one of those also. (hanging in the garage).
I prefer one that breaks the contact on the "positive " post. Maybe I'm just old fashioned.


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Old 01-12-2013, 06:45 AM   #8
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If you guys want a good disconnect and optional dual battery ,check out my mod .





hope the pics came thru.
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Old 01-12-2013, 11:22 AM   #9
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Quote:
Originally Posted by Old Farmer
I agree with you Bruce. I have one of those also. (hanging in the garage).
I prefer one that breaks the contact on the "positive " post.Â* Maybe I'm just old fashioned.

I prefer disconnecting the ground wire. the worst case with ground disconnected is it reconnects the battery. No shorts possible.
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Old 01-12-2013, 11:28 AM   #10
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Harley

Those Perko switches are nice, if my cheap method doesn't work out, I may try one of them or a disconnect like I used on my race car years ago.Edited by: JKgrizzly
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Old 01-12-2013, 10:47 PM   #11
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Quote:
Originally Posted by JKgrizzly
Quote:
Originally Posted by Old Farmer
I agree with you Bruce. I have one of those also. (hanging in the garage).
I prefer one that breaks the contact on the "positive " post. Maybe I'm just old fashioned.

I prefer disconnecting the ground wire. the worst case with ground disconnected is it reconnects the battery. No shorts possible.
I guess I don't understand how/where a short could be a concern with the positive connection broke.
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Old 01-12-2013, 11:17 PM   #12
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I just meant if your working on the switch,terminals, etc and your wrench touches something there won't be sparks. I know this can be wired either way, just my preference.
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Old 01-13-2013, 06:54 AM   #13
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Ya, but, doesn't the wrench then become the ground??

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Old 01-13-2013, 09:42 PM   #14
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I've had this style for several years. My first one apparently slightly melted when I did not have it screwed down tightly, the plastic knob began to look like it had been hot. I'm on the second one now and it works very well. I'm very cautious about tightening it down good or loosening it very good when disconnection is desired. Good product.
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Old 01-14-2013, 07:26 AM   #15
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Farmer, The frame is a big old wire that is open at the negative terminal of the battery. If your wrench hits the frame there will be no short, because the battery is out of the circuit.



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Old 01-14-2013, 11:01 AM   #16
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Yes I fully understand that, but that isn't was being referred to. He said if you were working on switches and such.
If you have the ground broke, and your wrench hits a hot wire and the "frame" you end up with a whole bunch of sparks.
That is the reason I like to break the positive post. That way you don't have a hot lead going to any switch just waiting for you to ground it out.
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Old 01-14-2013, 12:50 PM   #17
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I was referring to the disconnect switch. I didn't know we had moved away from the battery in our discussion.
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Old 01-14-2013, 02:48 PM   #18
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Quote:
Originally Posted by Old Farmer
Yes I fully understand that, but that isn't was being referred to. He said if you were working on switches and such.
Â*If you have the ground broke, and your wrench hits a hot wire and the "frame" you end up with a whole bunch of sparks.
That is the reason I like to break the positive post. That way you don't have a hot lead going to any switch just waiting for you to ground it out.
All of the following statements are correct if the trailer has no other power to it. If hooked to 120 AC then the converter keeps the hot side hot and disconnecting the battery will have no affect.

If the ground to the battery is open you can short any 12v lead in the trailer to trailer ground and nothing will happen(as long as you are not hooked to shore power). Because of the open lead on the battery it is out of circuit. Put the switch in either as either way the battery is no longer connected. I think the confusion came about because of the cautions about replacing a battery. When replacing ALWAYS remove the ground first. If while doing so the wrench touches ground nothing happens. After removing ground remove hot lead because if your wrench slips and contacts the trailer while on the hot side of the battery nothing happens, no ground. Reverse the order on replacing the battery. Hot first and then ground.
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Old 01-15-2013, 02:16 AM   #19
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Originally Posted by avvidclif
Quote:
Originally Posted by Old Farmer
Yes I fully understand that, but that isn't was being referred to. He said if you were working on switches and such.
If you have the ground broke, and your wrench hits a hot wire and the "frame" you end up with a whole bunch of sparks.
That is the reason I like to break the positive post. That way you don't have a hot lead going to any switch just waiting for you to ground it out.
All of the following statements are correct if the trailer has no other power to it. If hooked to 120 AC then the converter keeps the hot side hot and disconnecting the battery will have no affect.

If the ground to the battery is open you can short any 12v lead in the trailer to trailer ground and nothing will happen(as long as you are not hooked to shore power). Because of the open lead on the battery it is out of circuit. Put the switch in either as either way the battery is no longer connected. I think the confusion came about because of the cautions about replacing a battery. When replacing ALWAYS remove the ground first. If while doing so the wrench touches ground nothing happens. After removing ground remove hot lead because if your wrench slips and contacts the trailer while on the hot side of the battery nothing happens, no ground. Reverse the order on replacing the battery. Hot first and then ground.
Art you are right also, but I'm not sure if anybody leaves their rig plugged into AC when they are working on the batteries. I know I sure don't.

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