Fitment notes: 6-volt system; verify polarity before installation; some units may have been converted to 12-volt
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Control Modules — 1957 GMC 100 Series
Every control module on the 1955-1959 GMC 100 Series — where it lives, replacement time, and what it takes to program a replacement.
Headlight Dimmer Switch0.4 hr R&Rno coding
📍 Floor-mounted, left of clutch/brake pedal
⚠️ Mechanical foot-operated switch; no electronics. Included for completeness as the only 'control' component beyond fuses and relays.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
📝 1957 GMC 100 Series used simple single-speed wipers with basic hook-style arms typical of 1950s trucks. Many trucks of this era came without wipers as standard equipment or had aftermarket installations.
1957 GMC 100 Series used simple single-speed wipers with basic hook-style arms typical of 1950s trucks. Many trucks of this era came without wipers as standard equipment or had aftermarket installations.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 1957 GMC 100 Series 248ci I6 and can vary by trim.
🔧 Built by master technician Chris Hackleman · Master Technician · 20+ years.