My friend converted his 41 Chevy to 12 volts. Now, high and low beam have switched. The high beam indicator is on when the low beams are on. And when applying the brakes, the dash lights come on. Any ideas?? The amp gauge seems to be working fine. He always had his car hooked up 6 volt neg ground. Now its 12 volt neg ground. Had his original generator converted to 12 volts with a 12 volt reg. Changed all of the bulbs to 12 volt. 1157 bulbs in the rear. No park lights up front. No turn signals on vehicle as of yet. The only bulbs to change were the two rear lights and dash lights. Any ideas??