2004 Sierra 1500 alternator

[CF777]

Where do you guys recommend for me to buy a new alternator?

 

[04z71crew]

rockauto or amazon, whatever is cheaper. Stick with an ac delco unit, not worth the hassle of running an aftermarket that you can’t trust. If you have the 105 I would recommend upgrading to the 145 amp, they are usually the same price or cheaper. All you will need is a longer serpentine belt. Check the health of your battery, if it is worn out it can damage your new alternator so if it’s old

just throw a new one in there for peace of mind. Duracell makes a battery with a 48 month replacement, I have had no issues with mine.