Electrical Circuits; Starter Circuit; Generator Circuit - Pioneer 1200 Maintenance Service Manual

11
TROUBLESHOOTING AND ELECTRICAL SYSTEM: FE400 ENGINE

ELECTRICAL CIRCUITS

STARTER CIRCUIT

The starter circuit consists of a 12-volt battery, fuse, key switch, lockout cam limit switch, solenoid, starter/gen-
erator, and connecting wires (Figure 11-4, Page 11-8). See following NOTE.
NOTE: The starter circuit is completely independent of the ignition circuit. The battery does not supply
power for ignition. The battery supplies power to the starter/generator which in turn starts the
engine components rotating. Once the engine is running, the ignition circuit supplies power to the
spark plug. See Engine Ignition Circuit on page 11-9.
The starter circuit is activated when the key switch is turned to the START position. Electrical current is then
supplied to the solenoid coil, completing the circuit between the positive post of the battery and the F2 post of
the starter/generator. The starter/generator then turns and cranks the engine through belt-driven pulleys.
NOTE: Engine rotation (clockwise) when viewed from the clutch side of the engine.

GENERATOR CIRCUIT

The generator circuit consists of the starter/generator, voltage regulator, diode, solenoid, battery, and con-
necting wires (Figure 11-5, Page 11-9).
When battery power is first supplied to the starter/generator, it turns the engine at low RPM (approx. 700).
Once the engine starts running, the engine drives the starter/generator. At any engine RPM over 1215 (3000
starter/generator RPM), the starter/generator functions as a generator, supplying charging current, through
the diode, to the battery. To prevent battery overcharging, the voltage regulator senses battery voltage, and by
opening and closing an electronic switch, controls the amount of charge going to the battery.
Page 11-8 2003 Pioneer 1200/1200SE Gasoline Vehicle Maintenance and Service Manual
S
Figure 11-4 Key-Start Starter Circuit
Electrical Circuits