I have a 1938 Oliver 70 that had been converted to 12 volt using an alternator. I need a wiring diagram as several gauges, etc. had been disconnected.  I’m NOT an electrician and have very little experience  tracing electrical systems.  I need to see original wire placement and instructions on how to complete the 12 volt conversion. My tractor also has a distributor and not a magneto. Any suggestions?  Thanks!