Replaceing a battery

SUMMERVILLE

MEMBER
2001 ISUZU NPR
4 CYL
50,000 MILES

How do you replace the batteries on an izuzu npr truck, what is the wiring configuration

Thursday, May 19th, 2011 AT 12:16 PM

5 Replies

CARADIODOC

MECHANIC
33,871 POSTS

You have a positive cable and a negative cable. If you buy the correct battery, the two posts will be in the same locations as on the old battery. A lot of people seem to be switching the cables.

Here is a guide to help you

https://www.2carpros.com/articles/how-to-replace-a-car-battery

That can cause as little as a bunch of blown fuses, but usually a lot more severe and costly damage, including destroying the many computers on the vehicle. Most battery stores will install a new battery for you for free. That way you can be sure to avoid a costly mistake.

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Thursday, May 19th, 2011 AT 8:04 PM

SUMMERVILLE

MEMBER
2 POSTS

Hi Thanks for the reply, my problem is a little more difficult as there are 2 batteries and as they were missing when we purchased we can not be sure how the wiring goes

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Friday, May 20th, 2011 AT 9:13 AM

CARADIODOC

MECHANIC
33,871 POSTS

OHHH! Sorry to take so long to reply. The site isn't working on my regular computer. Don't want you to think I'm ignoring you.

Batteries are in parallel (negative to negative and positive to positive) to make it a higher current system at twelve volts. Negative will go to the ground side of vehicle and the positive will go to starter and lift gate if so equipped. If the batteries are behind the drivers side mounted on the frame, facing them the negatives will be on the left (towards driver) and the positives will be on the right towards rear of truck. Batteries will have two buss bar connectors, one for the negatives and one for the positives with two battery post connectors for each one.

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Saturday, May 21st, 2011 AT 6:31 AM

2CP-ARCHIVES

MEMBER
4,540 POSTS
2004 ISUZU NPR
30,000 MILES

How do I wire the dual batteries in my car? The batteries are missing so I have nothing to reference from. I am assuming the black with yellow strip cable is the positive and the all black is negative. I know its a twenty four volt system and the batteries need to be wired in series but not sure exactly how.

Thanks,
Shane

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Friday, April 26th, 2019 AT 7:04 PM (Merged)

JULIANBURKE

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0 POST

Who told you this is a twenty four volt system? It is not and do not attempt to hook it up as such! Batteries are in parallel (negative to negative and positive to positive) to make it a higher current system at twelve volts. Negative will go to the ground side of vehicle and the positive will go to starter and lift gate if so equipped. If the batteries are behind the drivers side mounted on the frame, facing them the negatives will be on the left (towards driver) and the positives will be on the right towards rear of truck. Batteries will have two buss bar connectors, one for the negatives and one for the positives with two battery post connectors for each one.