Does anyone know how to check the ignition wire voltage on both sides of the bulkhead connector in my 1967 Buick Skylark? The resistor wire is burning hot and it's not letting the alternator charge the battery like it should. I have a new alternator, but it won't charge the battery, it only gets 12.5 volts when its running but it should like 13.9 or 14.2. I believe that the problem is the ignition wire and after I do check it (once I figure out where to check), how many volts should it be? Thanks.