stock alternator output

[val620]

Does anyone know what the stock alt. puts out? I need to upgrade but I need to know what I have in now. I have a 98' 2door 4x4 LS tahoe. Thanks guys

 

[drowndindreams]

i think its somewhere in the 120 amp range.

 

[fyremanpat]

105 or 120 I believe. These came with two options for an alt.

 

[98crewcab]

just throw 2 of the 140amp stock ones in there reliable AND almost 300 amps

 

[SunlitComet]

give a dealer your vin and get a free vehicle build sheet with all the goodies installed.

 

[TigerEyz3]

Most likely you had a 105a alternator... However, as stated, there was a 120a option. Two ways to find out:

1. check the embossing/stamp on the alternator - it'll be on the firewall side, IIRC.
2. give the VIN to your dealer for look-up

My personal recommendation would be to upgrade to a ** alternator...preferably the large case variety. Factory alt supplies just enough juice for the factory options. Most of us use our trucks to do more than drive down the street...hence more juice on demand is a good thing.