Quote:
Originally Posted by Hans Moleman
I remember reading on the Tacoma forums years ago about being problems when going from a 24F to 27F battery.
The Tacoma that came from the factory with a 27F battery also has a high output 130 amp alternator whereas the one that came with 24F battery came has the standard output 90 amp alternator.
The problem when sticking a high capacity 27F battery into a truck with the standard output alternator can kill the battery quickly because it won't keep it fully charged.
However the 4Runner comes with a either a 100 amp or 130 amp alternator so maybe a 27F battery will work if you have the 130 amp alternator.
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If your truck with a 90a alternator can fully charge a 24F, it can fully charge a 27F.
In normal operating conditions, the alternator current capability has absolutely nothing to do with its ability to fully charge a battery because a full charge is completely dependent on system voltage, not available current.
The only time I would be concerned, is if you are actually using more current than the alt is capable of putting out. Because in that condition, and only in that condition, you will have voltage drop. How much drop depends on how much load you have in the system.
For most people, non-issue. If this was an issue most all battery tenders would not fully charge a car battery.
Think about dual battery setups too… you literally just doubled your capacity with the stock alternator. You could add 10 batteries, and as long as you can maintain your charge voltages, they will charge just fine. With that many batteries, It’s just going to take longer as the rate of charge will be split across each battery assuming you actually hit the alternators max output. The fuller a battery gets, its ability to accept current is also reduced.
