99 7.3 battery help
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Freshman User
Joined: Dec 2020
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99 7.3 battery help
Hi I looking for some advice about what to do with my battery situation, I have a 99 7.3 that has one 950cca battery (wife bought by mistake and can't return) and a 750cca. The 750cca battery isn't holding a charge anymore so with it being cold means I have to put a booster box to pick up slack. So I was wondering sense its recommended like a total of 1500 or so cca between two 750 cxa batteries what type of battery should I get. A 550cca or a 750cca?
Fleet Owner
Joined: Jan 2004
Posts: 26,007
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From: Brentwood,CA
No such thing as over amping. The batteries only provide what is demanded of them. Better get a matched pair in there soon because your one good battery is quickly going to be bad. Batteries don't pair well in mixed capacities and with a dead battery in the mix you will kill the working battery.
Laughing Gas
Joined: Nov 2020
Posts: 994
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From: Republic of Texas
Too much battery is not an issue, not enough is. Your truck will draw what it need to for operations including starting and normal equipment. The batteries not being big enough such as CCA will overheat the batteries and may cause catastrophic due to excessive amperage draw.
Also having miss matched batteries will cause current to not flow evenly between the batteries into the system (starter, sub systems of the truck, and such). Bad connections on the system will cause issues as well. That said can you run miss matched batteries for a bit, sure you can. You will not have a very effective system and you do risk damaging the batteries or something else.
Tried to keep is simple and that is hard because I have a strong background in electrical theory and application.
Hope it helps some
Jimmy
Also having miss matched batteries will cause current to not flow evenly between the batteries into the system (starter, sub systems of the truck, and such). Bad connections on the system will cause issues as well. That said can you run miss matched batteries for a bit, sure you can. You will not have a very effective system and you do risk damaging the batteries or something else.
Tried to keep is simple and that is hard because I have a strong background in electrical theory and application.
Hope it helps some
Jimmy
Logistics Pro
Joined: Jan 2010
Posts: 4,100
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Every vehicle I've ever owned has had the max CCA battery in it that would physically fit and still secure down in the battery tray. I had a 650 CCA battery in my first car, a '85 Dodge Omni. I have had nothing less than a 950 CCA in a truck unless I just couldn't find one that big and I needed a battery right away.
Basically go big or go home. You won't hurt your truck by running batteries with more CCA, if anything it'll actually start BETTER because you actually have enough juice to power everything.
Basically go big or go home. You won't hurt your truck by running batteries with more CCA, if anything it'll actually start BETTER because you actually have enough juice to power everything.
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