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Old 07-05-2017, 07:33 AM   #15
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Originally Posted by SteveSueMac View Post
I'm just thinking about the "internal" connection from - to + between the 2 batteries. I guess you'd remove the negative side of the jumper and then the negative terminal, then the positive side of the jumper and then the positive terminal...?
I would just leave that one connected. It's the "external" connections that would remove the load.

Or you could put a battery switch on the positive side of the "external" connections, and just use that to disconnect for storage.
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Old 07-05-2017, 08:28 AM   #16
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Hi

The "easy" place to put the disconnect switch on a pair of 6V batteries is in the jumper between the batteries.

Bob
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Old 07-05-2017, 09:25 AM   #17
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The reason to disconnect the - first and connect last is so if you hit the frame (or metal) accidentally with your wrench it won't throw a big spark.

I'm going to install one of these to kill all power from the batteries when stored.
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Old 07-05-2017, 11:51 AM   #18
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2 6 volt batteries

Here is a picture of my 6 volt battery setup. One point of note is that your current battery box may not be deep enough to hold the 6 volt batteries. We swapped out the 12v batteries to 6v when we bought our trailer and the dealer modified the battery box by cutting out the bottom of the box and welding 1 1/2in angle iron to the bottom of the box.
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Old 07-05-2017, 12:48 PM   #19
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If it help you to understand battery voltage a little better...Look at your maglite flashlight or any multi battery flaslight for that matter. The batteries are loaded up with all the + facing into the the tube...so the - end of the first battery is in contact with the + end of the second battery and so on....the jumper cable is JUST to connect the 2 batteries BECAUSE you can not physically attach the terminals of the batteries as you do with the flashlight. This is called a SERIES connection and thus the total voltage across the terminal is 6+6= 12VOLTS.
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Old 07-05-2017, 12:54 PM   #20
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The reason to disconnect the - first and connect last is so if you hit the frame (or metal) accidentally with your wrench it won't throw a big spark.
...
Hi

Or burn a big chunk out of the frame where the wrench hits ....

Bob
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Old 07-05-2017, 12:59 PM   #21
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I just don't get running a jumper cable from the + on one battery to the - on the other battery .
Sounds like trouble !
Hi

The formal answer to "why" is that if you don't make that connection, no current can flow. You need current to do anything useful.

Hopefully by now we have answered this? If not please chime in and we'll all try to come up with more details or analogies.

Bob
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Old 07-05-2017, 01:49 PM   #22
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how to connect two 6v batteries

Just to be real clear: Jumping + terminal on one battery to - terminal on the other ONLY applies to connecting two 6 volt batteries in SERIES to get 12 volts total.

If you are not solidly sure of what you are doing, please get a professional to help. Batteries can cause some interesting damage if mishandled. (Interesting in the 'Spockian' sense, if you get my drift...)
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Old 07-05-2017, 08:00 PM   #23
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Here's a schematic:

Attachment 288708
That's one set of cables.
What about the other set???>
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Old 07-05-2017, 08:15 PM   #24
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That's one set of cables.
What about the other set???>
They would need to connect just like the first set, so that they would get the full 12 volts from the batteries. Both positives (red) together, and both negatives (black) together.
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Old 07-05-2017, 08:35 PM   #25
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That's one set of cables.
What about the other set???>
Hi

Ok, go to Lowes, get a can of Orange spray paint and a can of blue spray paint.

Take the orange paint and spray every single wire that is connected to any of the + posts on the 12V setup orange. Do a real good job so the paint does not come off.

Take the blue paint and spray every single wire that is connected to any of the - posts on the 12V setup blue. Again get them all well painted.

Now pull all the wires off the posts on the 12V setup. Any wire with both ends off, throw away. Any wire with two disconnected ends on it, cut off the "extra" end and throw the extra end away.

Remove the 12V batteries and send them off to recycle land.

Drop the 6V batteries into the battery box. Hook the two 6V batteries up as shown in the earlier schematic.

Hook every wire with orange spray paint on it to the point on the schematic labeled red. Depending on your trailer that may be two wires, it may be a dozen wires.

Hook every single wire with blue spray paint on it to the point on the schematic labeled black. Again, depending on your trailer that may be one wire it may be three or four.

If that's not clear enough, head over to the local garage and pay them $10 to hook it all up for you. It should take them less than 10 minutes.

Bob
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Old 07-06-2017, 06:04 PM   #26
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connection

If you are still using the original cable provided by Airstream, i would suggest replacing your battery cables with 1/0 or bigger especially if you are using an inverter that is greater than 1000watts. My rig was originally supplied with a 4AWG cable so they double up on the cable as shown in the diagram on the right. You can also use this method using 2 cables per connection if you have the 4AWG cables.
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Old 07-06-2017, 06:08 PM   #27
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Hi

If you have a long run and a big inverter, go to at least 6/0 ...

(it all depends on how big that is and how long the run ...)

Bob
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