Here is the long awaited answer to my car's mystery symptoms, in particular the radio that only plays when the brake pedal is depressed.
The answer given by the mechanic following my car's failure to start is that the alternator he intalled 3 weeks earlier was producing too much power.
The way we figured it the radio includes some protective circuitry that shuts it off when too much voltage is received. By stepping on the brakes or turning on the A/C, the voltage must have been reduced to be within the allowable range and the radio started up. I don't know what accounts for the dead battery, unless it had a protective circuit that was more sensitive than the radio and it never received a charge.
The defective alternator was replaced at no charge.
Pun fully intended.
4 years ago