The factory fuse block in a classic C10 is a fire waiting to happen — overloaded circuits, brittle insulation, and missing circuit protection are extremely common on 50+ year old trucks. Upgrading to a modern fuse/relay panel is one of the best safety upgrades you can do.
This thread covers fuse panel choices (Painless, Kwik Wire, Ron Francis), relay-based high-current circuit management, labeling and documentation, and how to integrate a modern panel into a classic C10 dash without looking like a rat’s nest.
The Painless 10101 21-Circuit Wiring Harness includes a complete modern fuse/relay panel pre-engineered for classic C10 trucks — it’s the benchmark for how a classic truck rewire should be done.
Have you upgraded your classic truck’s fuse panel? What did you use?