Yeah, which model do you have? I make harnesses in house with 100% American wire. They're not cheap, and won't fall apart like the China harnesses. I make them to be the last harness you'll need. Wire joints properly crimped and sealed with adhesive-lined heat shrink. Just keep the wires out of the sun and you're good for many years.
The wire is the same standardized grade used by GM, Chrysler, and Ford with American copper and high quality cross-linked polyethylene insulation.
Wiring Harness, Engine, for Tomberlin Crossfire
https://www.buggydepot.com/product/3...crossfire.html
I recommend the Crossfire harness as it has all of the common denominator features found on the 150's and have adapters to make it (almost) universal for all models. I have the chassis section that runs to the front of the frame too if you need that.