1991 GMC R2500 Suburban V8 5.7L cs144 High Output Alternator

1991 GMC R2500 Suburban V8 5.7L cs144 High Output Alternator

Upgrade your 1991 GMC R2500 Suburban V8 5.7L cs144 with a high-output alternator from JS Alternators. This direct-fit alternator drops into your stock alternator location with no modifications required.

Key Features

• Direct Fit — Drops into your factory alternator location
• One Wire Connection — Connect to any ignition-switched 12V+ source to activate
• Smaller Pulley Included — Spins faster for maximum output
• High-Output Performance — Built for car audio, marine, racing, and high-demand electrical systems

Fitment

• 1991 GMC R2500 Suburban V8 5.7L cs144
• Direct replacement — bolts into the stock alternator location

Notes

• A smaller pulley is included — install a 1/2" to 1" shorter belt for proper fit
• If you require a specific voltage setpoint, purchase a compatible voltage regulator separately
• A Big 3 Wiring Upgrade Kit is required when installing any high-output alternator — 1/0 gauge 100% copper wire is recommended
• This alternator uses a one wire connection — it is not plug-and-play with your factory harness

Pro Tip: Pair this alternator with a Big 3 Wiring Upgrade Kit to ensure your electrical system can handle the increased output safely and efficiently.