Alternator Belt ·
Alternator Installation ·
High Output Alternator ·
Serpentine Belt ·
Shorter Belt ·
Finding the Perfect Fit: Your Guide to Selecting the Right Shorter Belt for Your High Output Alternator
Last updated: May 2026
Your JS Alternators high output alternator requires a shorter serpentine belt than your factory unit. Here's how to find the right one quickly.
Why You Need a Shorter Belt
High output alternators have a larger diameter than stock units. The belt routing geometry changes slightly, making the factory belt too long to maintain proper tension. See the full explanation: Why Do I Need a Shorter Belt?
How to Get the Right Belt
JS Alternators includes the exact belt specification with every order. Take the belt part number to any auto parts store — Gates, Dayco, and Continental belts are stocked at most locations.
For the complete selection guide with belt sizing by vehicle: Complete Belt Selection Guide