1969 nova original wiring for the most part. Someone has installed an alternator. When I turn the key – nothing. Just pulled and cleaned the old ground wires and checked them and they look good. There is a ground wire from; the battery to the block, battery to the radiator support, from the fire wall to the block, and from that connection (block) to the starter. Voltage looks good (app 12 volts) at the battery, and horn relay. The problem. The voltage on the ignition switch, mounted under the dash on the steering column, has 9.3 volts on the two wires in the middle of the switch. Also, 9.3 volts at the starter. I’ve had the car about 26 months and this started a couple of months ago. Cannot remember doing anything that caused this to stop working. I did have to replace the horn relay. Because, when I turned the lights on, the car would die. It would not restart for a minute or two. The horn relay appeared to be sticking. Once I replaced the relay it didn’t die on me again. Sense it is my daily driver I rigged a bypass to start the car. Now I need to make it work right. Please help.