high output alternator

[dre]

About to purchase a h.o alt. ......Is it true that the ecu controls the voltage. or something to that effect. please enlighten me. thanks for the info

 

[chip]

Good question!

My advice would be to ask the seller of the alternator if it's internally regulated. If the seller can't give you the correct answer, buy from someone else.

 

[ScottyBoy]

Someone asked pretty much the same question on another forum. Supposedly the 07+ trucks are regulated by either the PCM or the BCM. 06 and older trucks are not.
The guy was asking if the voltage could be adjusted with a tune, and Jenna told him no.