Mercury Repair Questions? Ask a Mechanic for Answers ASAP
STARTER SOLENOID LOCATION On the lower LH front of the engine, on the starter motor.
The solenoid switch on a cranking motor not only closes the circuit between the battery and the cranking motor but also shifts the drive pinion into mesh with the engine flywheel ring gear. This is done by means of a linkage between the solenoid switch plunger and the shift lever on the cranking motor.There are two windings in the solenoid; a pull-in winding and a hold-in winding. Both windings are energized when the external control switch is closed. They produce a magnetic field which pulls the plunger in so that the drive pinion is shifted into mesh, and the main contacts in the solenoid switch are closed to connect the battery directly to the cranking motor. Closing the main switch contacts shorts out the pull-in winding since this winding is connected across the main contacts. The magnetism produced by the hold-in winding is sufficient to hold the plunger in, and shorting out the pull-in winding reduces drain on the battery. When the control switch is opened, it disconnects the hold-in winding from the battery. When the hold-in winding is disconnected from the battery, the shift lever spring withdraws the plunger from the solenoid, opening the solenoid switch contacts and at the same time withdrawing the drive pinion from mesh. Proper operation of the switch depends on maintaining a definite balance between the magnetic strength of the pull-in and hold-in windings.This balance is established in the design by the size of the wire and the number of turns specified. An open circuit in the hold-in winding or attempts to crank with a discharged battery will cause the switch to chatter
MAKE SURE YOU LOOK AT THIS TSB !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
NO CRANK - POSSIBLE CORROSION AT STARTER SOLENOID - VEHICLES WITH 3.0L AND 3.8L ENGINES
DETAILED SERVICE PROCEDURE
It is incorporated as a solenoid at the statrer.
Disconnect vacuum line to Thermactor bypass valve before performing any cranking tests. After tests, run engine 3 minutes before connecting vacuum line.Starter Cranking Circuit Test
Starter Load Test