Ranger 4WD V6-245 4.0L (1991)
Ignition Timing Connector: Description and Operation
In-line Connector With Shorting Bar
The octane adjustment switch is used to retard the ignition timing three to four degrees.
When the switch jumper is INSTALLED, the timing is normal. With the jumper REMOVED, the timing is retarded. This is done to allow for optimum
spark advance for effective combustion of the air/fuel mixture.