12v wiring diagram Model A (1928-31) Sponsored Links (Register now to hide all advertisements). Hey guys, thought I would share these with you. I made them when I converted my Model A from 6v to 12 v. I know there are not many wires in these old cars.
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Converting a Model A to a negative-ground, 12V system certainly has its detractors, as does just about any modification to an old Model A.. Home Resources F-2831K 1928-31 Ford Model A 12 volt Negative Ground Conversion Installation Instructions F-2831K 1928-31 Ford Model A 12 volt Negative Ground Conversion Installation Instructions Click here to download the full guide with images Please read these instructions before you get started. 1.