slant 6 ignition problem !!

You are getting close...

Something is touching ground somewhere; examine every wire for compromised insulation. Look for melted insulation, chafed insulation around and over steering column, wiper linkage etc. Sniff for burnt smell. You need to run your fingers over each wire after it has been unwrapped from harness.

Look over headlight switch connections and all conductors going to it. Pay attention to lugs on back of amp gage, those are a direct connection to battery. Check factory taped splices, and rewrap with the good tape; 3M 33, anything else won’t stay fast for very long.