resistor/diode in parking break wiring
This is seat belt relay "I think."
But it does not match "quite" with what you have, at least for color
See Valiant instrument panel wiring, the 72 Plymouth manual you an download from MyMopar, page 8-152, there's an inset for the seat belt relay/ manual transmission:
The diode by the way is between the "diamond 7" and "diamond 8" symbols
Only other diode I know of was used in the headlights on/ key buzzer circuit
This is seat belt relay "I think."
But it does not match "quite" with what you have, at least for color
See Valiant instrument panel wiring, the 72 Plymouth manual you an download from MyMopar, page 8-152, there's an inset for the seat belt relay/ manual transmission:
The diode by the way is between the "diamond 7" and "diamond 8" symbols
Only other diode I know of was used in the headlights on/ key buzzer circuit
