I stongly suggest you replace the wiring harness. They are not complicated and run about $150 (I think??)

If you are just making a repair, here's a wiring diagram with the wire gauge on it... Its for a 55, but should answer your question...

Hope this helps and welcome to the forum

wiring diagram

Last edited by DMGfifty; 04/17/2013 11:32 PM.
David Gilmore
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1950 Chevy 3600