I have a 1964 MGB roadster that has been converted to negative ground. The car works great. I installed a radio in it and it works ok as long as the radio does'nt touch the metal on the car. The radio is grounded correctley and no wires are crossed. I was wondering if there was something that wasn't changed when they did the conversion. The only other thing that does'nt work correctley is the gas gauge and the sending unit has been replaced, maybe the two are related to the conversion. any help would be appreciated. Thanks, Jon