Father, Son, and Grand Father project. 1963 Valiant

I chased some voltage drop issues in mine a few times. The first two were faulty voltage regulators, after that was a bad ground (which I severely doubt you have based on how it’s fastened) and the last time I finally tracked it down to a 3V loss somewhere between the steering column and the bulkhead connector.

I didn’t feel like dorking around with it so I installed a relay straight off the starter relay to run into the ignition circuit bypassing the column wiring...totally not what I’d recommend anyone else do, but it’s my car and I was comfortable with that particular fix as it kept the voltage in check and I have zero problems with it after it sat for 5 years.