E 250 Van V8-7.3L DSL (1988)
Cruise Control Switch: Testing and Inspection
Disconnect 6-way connector from control switch at the amplifier, then perform the following checks:
1.
Connect a voltmeter between light blue-black hash lead and ground, then depress On button and check for battery voltage.
2.
Turn ignition Off, then connect an ohmmeter between light blue/black lead and ground.
3.
Rotate steering wheel throughout its full range while making the following checks:
a.
Depress Off button and check for a reading of 0-1 ohm. If resistance is greater then 1 ohm, the wiring, slip rings, copper brushes in the turn
signal switch or the switch is faulty or the steering column is improperly grounded. To inspect for proper ground, connect ohmmeter between
an good electrical ground point on the body sheet metal and the steering column upper flange. Resistance should be less then 1/2 ohm. If
resistance of 3 ohms or higher is indicated, clean horn brush contacts and the ground brush. A resistance of less than 1 ohm must be obtained
prior to performing remaining tests.
b.
Depress Set button and a reading of about 680 ohms should be indicated.
c.
Depress and hold Coast switch and a reading of about 120 ohms should be indicated.
d.
Depress and hold Resume switch and check for a reading of approximately 2200 ohms.
