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Old 08-05-2016, 10:17 AM   #1
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Dual battery install steps?

I'm going to add a 2nd battery this afternoon and I was hoping to validate that my logic is right. I'm planning on:

1. Disconnecting the positive trailer lead

2. Disconnecting the negative trailer lead

3. Running a jumper from battery #1 negative to battery #2 negative

4. Running a jumper from battery #1 positive to battery #2 positive

5. Reconnecting trailer negative to battery #1

6. Reconnecting trailer positive to battery #2

Sound right?
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Old 08-05-2016, 10:24 AM   #2
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It depends if you are using 2 12 volt or 2 6 volt
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Old 08-05-2016, 10:26 AM   #3
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Quote:
Originally Posted by Jeepin_182G View Post
I'm going to add a 2nd battery this afternoon and I was hoping to validate that my logic is right. I'm planning on:

1. Disconnecting the NEGATIVE trailer lead

2. Disconnecting the POSITIVE trailer lead

3. Running a jumper from battery #1 negative to battery #2 negative

4. Running a jumper from battery #1 positive to battery #2 positive

5. Reconnecting trailer POSITIVE to battery #1

6. Reconnecting trailer NEGATIVE to battery #2

Sound right?
This slight change keeps you from accidentally touching your wrench to the frame ground while connecting/disconnecting the Positive terminal. Which would cause a spark and possible explosion.

ETA: since you state 'adding a second battery' I assume your current single battery and the additional battery are both 12 volt.
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Old 08-05-2016, 10:29 AM   #4
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Quote:
Originally Posted by Jeepin_182G View Post
I'm going to add a 2nd battery this afternoon and I was hoping to validate that my logic is right. I'm planning on:

1. Disconnecting the positive trailer lead

2. Disconnecting the negative trailer lead

3. Running a jumper from battery #1 negative to battery #2 negative

4. Running a jumper from battery #1 positive to battery #2 positive

5. Reconnecting trailer negative to battery #1

6. Reconnecting trailer positive to battery #2

Sound right?
correct, I will add that the batteries should match, meaning same size and same age.
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Old 08-05-2016, 10:30 AM   #5
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Would be a 2nd one of these
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Old 08-05-2016, 11:54 AM   #6
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Originally Posted by SuicideSaints View Post
correct, I will add that the batteries should match, meaning same size and same age.

Thanks for the input SiicideSaints. I was able to get the same size battery. As to the age, the current trailer battery was only used during the drive home from the dealership and then it was connected to the TV so it's practically new.
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Old 08-05-2016, 12:22 PM   #7
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you should be just fine then
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Old 08-05-2016, 12:52 PM   #8
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To join batteries in parallel, use a set of cables to connect both the positive terminals and another set of cables to connect both the negative terminals of both batteries to each other. Negative to negative and positive to positive. You then connect your load to ONE of the batteries, but both drain equally.
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Old 08-05-2016, 01:16 PM   #9
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I would add a shut off also. The shutoff that is standard on the trailer still allows a lot of drain.
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Old 08-05-2016, 01:32 PM   #10
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