GMC C3500 Wiring Harnesses & Electrical - OEM-Fit Harnesses & Components
Restore your GMC C3500’s electrical system with precision-engineered wiring harnesses and electrical components designed specifically for your vehicle. Each harness is manufactured to match the original routing, connectors, and circuits of your GMC C3500—restoring the wiring behind the dash, under the hood, and through the body to factory-correct, or factory-improved, condition.
Our GMC C3500 electrical lineup includes complete wiring harness sets, battery cables and ground straps, switches, electrical devices, and update/conversion products such as alternator upgrades and electronic ignition conversions. Every component is manufactured and tested to deliver dependable, factory-correct performance, and is organized by your vehicle’s exact year to ensure the harness or component you order is the one built for your GMC C3500—not a close approximation.
Use the Vehicle Selector above to find the correct wiring or electrical component for your GMC C3500, or browse below to explore available options. Whether you’re chasing judging points with a numbers-matching restoration or simply getting your GMC C3500 running right, Factory Interiors makes it easy to restore your electrical system with wiring products proudly made in the USA.
allows use of an aftermarket carburetor equipped with an electric choke, to replace the original Rochester carb. equipped with an electric choke, without cutting your original choke wire
(wiring from speaker to speaker harness connector, 1 required per speaker) Use when installing aftermarket speakers. Made to solder wires directly to aftermarket speaker and with correct connector for connection to original wiring.
front single dash speaker, (wiring from speaker to speaker harness connector) Use when installing aftermarket speaker. Made to solder wires directly to aftermarket speaker and with correct connector for connection to original wiring.
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