I recently have had a problem with my '71. I noptice the problem mostly at night. It seems when my car hits bumps my headlights will dim and I can hear a crackling sound through the radio, sometimes the generator light will come on at the same time but only momentarily. I have tried it w/the radio on or off and the headlights on and off to try and isolate the problem. Still does it. Am I correct to assume if my lights were shorting it would blow the fuse? It leads me to think it's a power supply(battery) or generation(alternator) problem. The only work I have done recently is replace the battery and the cables. I checked out all the wiring but I have yet to find anything obviously shorting out. I'm trying to sell this car but who would buy it if it's got problems? Any help would be appreciated!!!!!