Join Date: Mar 2002
Location: Austin, TX, USA
May be a bad ground. Sounds like the starter may be trying to pull ground through the lighting system. Is the negative cable grounded to the block well? When you crank, do you see any smoke coming from the negative cable clamp or connection to the block? The starter motor draws over 100 Amps. It doesn't take much of a bad connection for it to attempt to pull current through another circuit's ground.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI