Wiring is where a lot of classic car projects go to die: brittle insulation, mystery splices, random colors, and “temporary” fixes that turn into permanent hazards. From the Lone Star Street Rod Association State Run in Granbury, Texas, we sit down with Dennis Overholster from Painless Performance Products, the company so many builders mention when they want a clean, reliable automotive wiring harness for a street rod, classic truck, or restoration.

Dennis breaks down what Painless actually does day to day, from using tens of millions of feet of wire each year to building harnesses by hand on layout boards for consistent routing and branch lengths. We get into the real craft of reverse engineering: bringing a vehicle into the shop, deconstructing the original harness, building prototypes, test-fitting, documenting every change, and then producing a kit that’s repeatable. If you’ve ever wondered why a good harness costs what it costs, the “it can take a year to get it right” explanation lands hard.

We also go practical with classic car electrical upgrades: six volt versus twelve volt systems, choosing wire gauge with headroom, and why a simple relay often fixes problems when modern accessories like air conditioning demand more current than the original circuit can safely deliver. And if you’re nervous about installation, you’ll love hearing about the full-color manuals and the phone support that helps first-timers avoid expensive mistakes.

If you enjoy smart car talk and want fewer electrical surprises, subscribe, share this with a friend who hates wiring, and leave us a review so more builders can find the show.

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