Hold-In Coil Winding-Resistance Test; Solenoid Contact-Point Connection Test - Jeep 1987 Wrangler Workshop Manual

ELECTRICAL
STARTING SYSTEM - MOTORCRAFT (8-CyL Engine)
Determine the exact starter motor RPM using a
mechanical tachometer (not shown).
NOTE: To connect a mechanical tachometer,
remove the seal from the end of the drive end
housing and clean the grease from the end of
the armature shaft.
Disconnect the battery cable from the starter
motor.
Turn the load control knob toward INCREASE
(clockwise) until the voltage is exactly the same
as it was with the battery connected to the starter
motor. Switch to the AMP position on the tester.
If the amperage at no-load speed is below the
specification, the starter motor has high
electrical resistance and should be repaired or
replaced.
If the amperage is higher than specification and
the starter motor RPM is less than the minimum
RPM specification, disassemble, clean, inspect
and test the starter motor.
Hold In Coil Winding-Resistance Test
This test will determine the resistance of the
hold-in coil winding.
Insert a piece of paper (1) between the contact
points to insulate them.
Use an ohmmeter to measure the resistance
between the S-terminal (2) and the starter motor
frame.
The resistance should be between 2.0 and 3.5
ohms. If the resistance is outside the speci-
fication, replace the field winding assembly.
Solenoid Contact-Point Connection Test
This test will determine the quality of the solder
joint at the contacts. Use an ohmmeter to test
the resistance through solder joint (3).
If the resistance is more than zero
ohms, the joint has excessive resistance. Repair
by resoldering the joint with a 600 watt soldering
iron.
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