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1967-1978 GMC G15 L6 4.1L 12si High Output Alternator
1967-1978 GMC G15 L6 4.1L 12si High Output Alternator
1967-1978 GMC G15 L6 4.1L 12si High Output Alternator
Upgrade your 1967-1978 GMC G15 L6 4.1L 12si 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
- Smaller Pulley Included — Spins faster for maximum output
- High-Output Performance — Built for car audio, marine, racing, and high-demand electrical systems
Fitment
- 1967-1978 GMC G15 L6 4.1L 12si
- 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
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.