EAG

Hello, 1951 DeSoto Custom 6 volt positive ground No start with key. I only get a click. I can jump the start with a screwdriver and she starts right up and runs, but not with key. And, can only shut it off by disconnecting coil wire. I have 6 volts at the ignition switch but on 5 at the solenoid. Ignition wire runs to ?horn/ignition relay on firewall. Can I bypass that relay and connect directly to solenoid? Or are there other options or fixes?