Road trip from Houston to Dallas

AGM Battery Replacement?

clovisb31 · 2026-03-20T20:49:26+00:00

Hello, I'm thinking about replacing the OE flooded lead acid battery with an equivalent size AGM type battery. The Tacoma charging system provides 13.9 Volts to the stock OE battery. An AGM battery typically needs 14.4-14.6 volts to properly charge. Is the alternator/charging system voltage able to be changed/increased to allow for proper AGM charging? Does anyone know what the procedure is? Is a dealer level Scan tool required to do this modification? Thanks in advance.

underground.trd

New member

Jun 12, 2024

Just hit the 5K mile mark and this truck has been a blast =) we most recently did a 600 mile road trip from Houston to Dallas (and back)

Still determined to build the best “Swiss-army knife” of a truck for our lifestyle (check out the MPG we averaged on the way up to Dallas)

Road trip from Houston to Dallas

underground.trd

New member

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