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Old 02-14-2016, 10:36 AM   #1
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Install battery disconnect

Question from an electrically handicapped guy.
I would like to know how to install a Battery Doctor #20393 disconnect switch on dual 12V batteries. It states connect lug#1 to positive Battery #1 and Lug #2 to positive Battery #2. Got that part. Then connect common terminal to "starter or solenoid." That's where I lose it.

What do I connect common terminal to exactly? Seems like it should go to inside the TT with the original wire that's connected already, but which wire?

Happy RVing,
Jeff.
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Old 02-14-2016, 11:07 AM   #2
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That would be to the positive line to the camper itself.
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Old 02-14-2016, 01:32 PM   #3
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Is your goal to have 2 SEPERATE battery banks?
Or is it to just have an ON/OFF disconnect switch for the batteries.

Hooking it up the way you are describing, you will be able to run off one battery, or the other battery, or combine both batteries.
You will only be able to charge both the batteries together when on combined(1+2).

Otherwise, if you discharge one battery and switch to the other battery, then the dead battery will never charge until you switch to 1+2, or switch back to the dead battery.
If you switch to 1+2 to charge them again and one battery is 90% full and the other is dead then your smart charger won't charge properly because it won't read that one battery is dead.

I think you would be better off wiring your 12v batteries in parallel and using the switch as a simple disconnect.

Just my thoughts ... Someone correct me if I'm wrong.
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Old 02-14-2016, 01:51 PM   #4
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Quote:
Originally Posted by klassic View Post
Is your goal to have 2 SEPERATE battery banks?
Or is it to just have an ON/OFF disconnect switch for the batteries.

Hooking it up the way you are describing, you will be able to run off one battery, or the other battery, or combine both batteries.
You will only be able to charge both the batteries together when on combined(1+2).

Otherwise, if you discharge one battery and switch to the other battery, then the dead battery will never charge until you switch to 1+2, or switch back to the dead battery.
If you switch to 1+2 to charge them again and one battery is 90% full and the other is dead then your smart charger won't charge properly because it won't read that one battery is dead.

I think you would be better off wiring your 12v batteries in parallel and using the switch as a simple disconnect.

Just my thoughts ... Someone correct me if I'm wrong.
Klassic-
Yea, your are right. Hadn't thought about that but only want to disconnect both at same time. Picked this one up for $20 at a CW in Mesa,AZ so I'll see if I can trade for a single on/off disconnect at CW in Albuquerque next Tuesday.
Aren't the batteries already hooked up parallel by dealer? Guess I'll check.
Thanks much for the input.
Happy RVing,
Jeff
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Old 02-14-2016, 02:06 PM   #5
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You could still use it. Unless a simple disconnect is much cheaper and worth talking it back.
Just hook up your two parallel batteries to "1" and the trailer side to the common.
You would disconnect by turning to "off". Turning to "2" just wouldn't do anything.
Hopefully you have an OEM breaker or fuse in that battery wiring somewhere.
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Old 02-14-2016, 02:15 PM   #6
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That sounds good...both on the #1. If CW won't give me an exchange deal, I'll just do as you suggested.

Now you see what I meant by "electrically handicapped." Lol

Happy RVing,
Jeff
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Old 02-14-2016, 02:21 PM   #7
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No not both on number one.
The batteries on number 1 lug and the trailer side on the bottom lug. (I don't know what they labeled it)

Unless you meant battery one and battery two on number 1. Then that's a waste of time and wire. They should already be hooked up in parallel in your battery box.
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Old 02-14-2016, 02:29 PM   #8
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Okay, guess I'm to dense to understand. Bear with me and let me know if I understand correctly:
If I get a simple on/off disconnect switch, I hook up only one battery positive cable to switch. I take off the trailer positive and hook to the other terminal in switch.That will break the positive current flow and stop parasitic usage? Right?

Happy RVing,
Jeff
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Old 02-14-2016, 03:00 PM   #9
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Yep.

AND if you want to just use the switch you already have then hook that one positive battery cable to the lug "1" and the trailer positive to the lug underneath at the bottom of lugs 1 and 2.

In both cases you SHOULD have a breaker or fuse between the battery and the switch. In case something grounds out the lugs on your disconnect switch, or your wire gets nicked.
I'm sure Jayco has one there somewhere, but you need to make sure it is between the batteries and the switch now.
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Old 02-17-2016, 09:23 AM   #10
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Klassic-
Got a single on/off disconnect at CW yesterday. This one says to hook up on the negative line. The double one said the positive line. Why the difference?

Happy RVing,
Jeff
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