S10/T10 Blazer 4WD V6-262 4.3L VIN W CPI (1992)
Ignition Coil: Description and Operation
HEI Distributor With External Coil
The distributor has an exterior ignition coil. The exterior coil is mounted remote from the distributor and is connected to the rotor through a high
tension coil wire.
The coil is built like a transformer with the winding surrounded by a laminated iron frame. It steps up battery voltage (12 volts) to high voltage (up to
35,000 volts). The primary circuit is energized when the ignition switch is in the "ON" position. When the ignition module breaks the circuit to
ground, on the primary (negative side of coil) circuit, the magnetic field collapses, which induces high voltage in the secondary circuit, which finds its
ground at the spark plug.
