Alternator

UMEXT

Original poster
Dec 16, 2011
110
I need a new serpentine belt, went to the parts store by my work, and the first thing they asked was, 130 or 150 amp alternator?

So, how can I tell? Should I just assume I have the 150 because I have the EXT with the rear air? (The only other option on the whole bloody truck that's electrically powered is the voice recorder.)

Thanks in advance for the help...
 

Busterbrown

Member
Dec 4, 2011
253
IIRC, I think all TV's have a stock 150amp alternator. With regards to the belt, your LWB model requires the shorter belt. The SWB models use the longer belt. I forget the length on each though. A quick AAP search shows 915 for the SWB and 905 for the LWB. (I'm assuming CM's)
 

Wooluf1952

Member
Nov 20, 2011
2,663
Milwaukee, Wisconsin
:iagree: It has nothing to do with the alt.

The LWB has a smaller PS pump pulley. That's why the belt is shorter.
 

The_Roadie

Lifetime VIP Donor
Member
Nov 19, 2011
9,957
Portland, OR
The parts store software has been asking the wrong question since Day 1 of the platform. All alternators are 150A, but GM probably changed their mind at launch time and deleted a planned 130A option. As posted, the correct question is LWB versus SWB, and it helps if you know the vehicle better than the parts store clerks. :wink:
 

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