What happens to the solenoid pull-in coil once the starter motor is running?

As current flows to the motor, the solenoid pull-in coil is bypassed.

What switch is in the start circuit on manual vs. automatic transmissions?

Manual transmissions use a clutch pedal position (CPP) switch (shown with the clutch pedal released); automatics use a park/neutral position switch, which is closed in Park or Neutral.

What wire colors/circuits are shown in the starting system diagram?

Circuit 33 W/PK (white/pink) from the ignition switch, circuit 32 R/LB (red/light blue) to the starter relay, an R wire to the starter solenoid, and a BK (black) battery ground wire.

Where can more detail on this circuit be found?

The diagram notes: 'See EVTM for more details of this circuit.'

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1993 Ford Mustang Starting System Wiring Diagram & Operation (03-06-2)

Starting system wiring diagram with ignition switch, starter relay and solenoid

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Starting-system wiring diagram showing the ignition switch, neutral safety switches, starter relay, solenoid and battery circuit.

AI caption October 2006 · Photo 32 of 78

This is page 03-06-2 from a Ford service manual section titled 'Starting System — Description and Operation (Continued)'. The page finishes a numbered explanation (steps 6–9) of how the starting system works: current flows to the starter motor so the drive pinion gear cranks the flywheel and crankshaft; as current flows the solenoid pull-in coil is bypassed while the hold-in coil keeps the pinion gear engaged with the flywheel; the gear remains engaged until the ignition switch is released from START. Below the text is a simplified starting system wiring diagram showing the ignition switch (HOT AT ALL TIMES, with START/RUN/ACC/OFF/LOCK positions), circuit 33 W/PK (white/pink), branching to either a clutch pedal position (CPP) switch for manual transmissions or a park/neutral position switch (closed in Park or Neutral) for automatics, then circuit 32 R/LB (red/light blue) to the starter relay, the battery, and the starter motor/solenoid with its pull-in and hold-in coils and motor terminal (M). A note directs readers to the EVTM (Electrical & Vacuum Troubleshooting Manual) for more circuit detail. Diagram reference number J4494-A appears at the lower right.

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Frequently asked questions

How does the starter stay engaged with the flywheel during cranking?: The solenoid hold-in coil keeps the drive pinion gear engaged with the flywheel; the gear remains engaged until the ignition switch is released from the START position.
What happens to the solenoid pull-in coil once the starter motor is running?: As current flows to the motor, the solenoid pull-in coil is bypassed.
What switch is in the start circuit on manual vs. automatic transmissions?: Manual transmissions use a clutch pedal position (CPP) switch (shown with the clutch pedal released); automatics use a park/neutral position switch, which is closed in Park or Neutral.
What wire colors/circuits are shown in the starting system diagram?: Circuit 33 W/PK (white/pink) from the ignition switch, circuit 32 R/LB (red/light blue) to the starter relay, an R wire to the starter solenoid, and a BK (black) battery ground wire.
Where can more detail on this circuit be found?: The diagram notes: 'See EVTM for more details of this circuit.'