the Start pushbutton on my 420G dash is no longer reliable, and have temporarily fitted a parallel bypass
when the dash button fails, the “auto inhibitor” relay still clicks
I cant figure out if the dash button delivers initial current for the Solenoid ? (in all Saloons)?
or in my case whether the auto inhibitor relay is before, after or parallel to the dash button?..
even looking at the circuit diagram…( I dont think its after, but it does have heavy wires)
I can either replace the dash button and/or add a relay right before the solenoid
Judging by the schematic I have, the neutral interlock is just a switch. The contacts close if you are in park or Neutral (and a separate set of contacts close when “R” is selected to operate the reverse lamps).
The P/N contact is in series, between the pushbutton and the starter solenoid.
(The starter buttons rarely fail, neutral interlock switches, otoh…)