Working on a 1930 model A street rod. 350 Chevy engine, 4 speed manual transmission. Top of the line battery. The car previously had a 4 gauge copper ground wire that went from the negative post on the battery to the frame that was about 2 feet long. We thought we would upgrade by going to a 1/0 ground cable from the battery to the engine block (about 7 feet long). That is the only change that we made. When the car was grounded to the frame the engine would turn over with the lights on. Now that we have upgraded the ground cable from the battery to the engine block, the engine will not turn over with the lights on. Does not make sense to me. Anyone have any ideas why this is happening?