Putting the 2nd battery back

[Army-C2500]

Shouldn't have waited until it got cold to ask about this:

I have a C2500 with the 6.2 detroit diesel motor, the geniuses who had it before me decided to rip out the 2nd battery and all its wiring. All they left me was the battery tray, what do I need to put the 2nd battery back and hook it up the right way?

 

[someotherguy]

Factory service manual is your friend here. https://www.gmt400.com/threads/88-98-service-manuals.43575/

Look up your specific year model and there will be diagrams showing how it was wired up. Be sure to look for the section showing your specific model, engine, transmission combination.

Richard

 

[Army-C2500]

I looked at the diagrams and now know where to connect it but how do I find the exact size positive battery cable that is exactly the right size? Is there a parts manual where I can look that up

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[RichLo]

Make your own with good 4, 2, or 0 gauge wire or parts stores / farm implement stores have pre-made cables in 1-ft increments.

If I'm forced to buy pre-made I always go to a farm tractor supply store for battery cables. They are built way better and are usually cheaper.

 

[618 Syndicate]

Make your own with good 4, 2, or 0 gauge wire or parts stores / farm implement stores have pre-made cables in 1-ft increments.

If I'm forced to buy pre-made I always go to a farm tractor supply store for battery cables. They are built way better and are usually cheaper.

This. Ensure they are copper core not aluminum.

 

[Schurkey]

I looked at the diagrams and now know where to connect it but how do I find the exact size positive battery cable that is exactly the right size? Is there a parts manual where I can look that up

Am I wrong? The wire gauge size is circled in red. .32mm squared is approximately equal to 12-gauge AWG.

Which doesn't make sense unless these are secondary cables; primary battery cables should be 4-gauge minimum. Note that the RH battery has an 8.0mm squared ground wire, approximately equivalent to 1/0 AWG.

Where did you get that diagram? Is it from a section of the service manual dealing with some accessory, rather than showing the main battery cables?

 

[Erik the Awful]

Make your own with good 4, 2, or 0 gauge wire or parts stores / farm implement stores have pre-made cables in 1-ft increments.

If I'm forced to buy pre-made I always go to a farm tractor supply store for battery cables. They are built way better and are usually cheaper.

Pull-A-Part usually has a BMW X5 or two. Even cheaper, really long, and really good quality. You just have to pull half the interior to get them.