I work on the side for a car dealer friend of mine, He can buy a car at a discount because the radio/heater/"Tokyo by night" dashboard doesn't work.
I get to fix it, get paid for it and he can resell the car. Everybody's happy, and I can buy my cars cheap.
That and I can work on my own vintage British car's wiring, The wiring is easier to figure out than the diagrams!
I also rewire the odd steam loco too. steam driven generator at 32 vdc.

TW