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Old 04-06-2024, 10:48 PM   #1
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correct battery wiring?

I just bought a 2004 Bluebird bus. It only had one battery in it when I purchased it, but it starts and runs. It has the C7 Caterpillar 6 cylinder. The question is, I believe it needs two batteries. It has 4 cables coming into the battery box. One black and red pair, heavy gauge, and one black and red pair, medium gauge. Both red cables are hooked to the positive, and both black cables are hooked to the negative on this one battery. How do I correctly hook up two batteries? See attached photos for clarity.
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Old 04-16-2024, 11:54 AM   #2
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It seems quite likely that both red wires are going to the same place and both black wires are as well.
If that is right, you can just run the 2 reds to the 2 positive battery posts and the 2 black wires to the 2 negative posts.
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Old 04-16-2024, 07:59 PM   #3
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Yeah, that looks like they removed the two that were in there and replaced the truck battery with a significantly larger one.



Although the label in the second picture says that it's a Group 31 battery, which is what is usually in most of them.
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Old 04-19-2024, 07:07 PM   #4
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I'd add two fresh batteries once that one dies. Using only one battery is going to put a lot of strain on it's longevity. Using 2-3 batteries makes starting effortless on the batteries. It's load sharing the amperage. With only one, it is going to go hard on cranks. It will work but not for a long time.

2 batteries is more normal and shares the load. If you just but one fresh battery, that older battery may strain, or the new one may die sooner as it's having to work more to make up for the bad older one in worse shape. If you can find a 2nd battery and only want to buy one, buy the cheapest battery matching the specs of the battery that's there you can find.
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