Battery issue?

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Dec 7, 2013 | 11:13 PM

auriferous

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Battery issue?

replaced one battery in feb,the other [pass side ] was reading 12.5 volts when i replaced the drivers side and i was hoping to get away with just one purchase . been having problems with my banks iq acting funny and the truck will sit for 3-4 days a week then when i start her up she sounds weak,I drive around town and she seems to pick up a charge from the alt. fine and sounds great on restarts that day . check the alt. and she puts out 14.4 amps at the batt [only 1 alt] DID I make a mistake by not replacing both battery's?

Dec 8, 2013 | 05:25 AM

slowmans

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Joined: Jan 2006

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From: SE. MA

Yes, replace the other battery. You should always replace in pairs , hopefully the other battery didn't ruin the good one...

Dec 24, 2013 | 01:02 AM

auriferous

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well I replaced the other battery and it seems to be what the issue was,and had a complete check thru the truck for parasitic draws which showed normal draws. BUT! my banks IQ **** the bed! and found a thread on the diesel stop about low voltage drops causing IQ's to lose their program etc. [ Senix chimed in ,seems he had this issue also] so back to banks to get it reprogrammed after getting an upgrade a month ago.this IQ has been problematic for some time and gotta say it is wearing thin .

Dec 24, 2013 | 10:25 PM

GSchretter

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Joined: Jan 2000

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From: Irving Texas

Really?

Always replace both batteries at the same time.

Why would you think one battery goes bad due to age or usage and not the other..

Dec 25, 2013 | 12:26 AM

RM2738

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Joined: Sep 2010

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From: The Woodlands, TX

Yup.... Always in pairs. Like lots of things in a vehicle. Tires, shocks, breaks, wipers....

Dec 25, 2013 | 10:48 AM

caddy

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Joined: Apr 2009

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From: Houston

I replaced one battery the 2nd yr and the other the 3rd yr. I think they might have been undersized originally. The oem batteries were 750 if I remember right but replacements were 850.