When turning the key no longer brings your GM classic to life cleanly, the Standard Ignition switch US-131 is designed to replace the worn ignition starter switch. It is a direct-fit replacement for the listed applications, including the 1984-1989 Buick Century, 1984-1988 Cadillac Cimarron, 1984-1990 Chevrolet Cavalier, 1984-1986 and 1988 Chevrolet Celebrity, 1984-1985 and 1993 Chevrolet S10, 1984-1985 GMC K1500, 1984-1990 Oldsmobile Cutlass Ciera, 1984-1992 Pontiac Firebird, 1991 GMC Syclone and 1993 GMC Typhoon.
The ignition starter switch is the electrical switch that routes power to the ignition and starter circuits as the key moves through its positions. Signs this part may need replacing include:
These symptoms can also come from other faults, so diagnose the cause before replacing the switch. If a failed ignition switch is the cause, US-131 replaces it.
Fitment covers 78 applications across Buick, Cadillac, Chevrolet, GMC, Oldsmobile and Pontiac vehicles from 1984 through 1994. See the Buyer's Guide tab for the full list and engine details.
Interchange: CS142 · IS85 · LS512 · KS6649 · 07843451 · 1990114 · 7843451 · KS6649SB
This part cross-references / interchanges with the following part numbers:
What does the Standard Ignition US-131 do?
It is an ignition starter switch that routes power to the ignition and starter circuits as the key is turned. Its copper alloy conductors are designed for high conductivity with low resistive losses.
Will this S10 switch fit my truck?
US-131 is listed for the 1984-1985 and 1993 Chevrolet S10, and for the 1984 and 1986 Chevrolet S10 Blazer. Check the Buyer's Guide tab for your exact year and engine.
Does it work as a Celebrity switch replacement?
Yes. It is listed for the 1984-1986 and 1988 Chevrolet Celebrity. See the Buyer's Guide tab for engine details for your car.
What are signs an ignition switch may need replacing?
Common signs include no crank when the key is turned, stalling or intermittent power loss, and accessories that don't power up in the expected key position. Other faults can cause these, so diagnose first.
Is the switch tested before it ships?
Yes. Standard Ignition 100% tests its switches to verify both mechanical and electrical switching performance.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
