Ranger 4WD V6-177 2.9L (1988)
Cruise Control Switch: Testing and Inspection
1.
Check main fuse and stop lamp fuse and replace as necessary, then remove steering wheel cover.
2.
With ignition off, connect an ohmmeter between purple/orange wire and black wire of steering wheel connector, then depress On switch and check
for a reading of 0-1 ohms.
3.
If reading is not correct, replace switch assembly, then clean brush assembly and slip rings in a suitable solvent and lubricate with a suitable
lubricant.
4.
With ignition switch off, connect an ohmmeter between light blue/black wire and black wire of steering wheel connector, then depress the
following switches and check for values indicated:
a.
Off, 0-1 ohm.
b.
Set/Accel, 646-714 ohms.
c.
Coast, 114-126 ohms.
d.
Resume, 2090-2310 ohms.
5.
If values are not correct, clean and lubricate brushes and slip rings, then replace switch.
6.
With ignition off, connect voltmeter between blue/black and black wires of steering wheel connector, then proceed as follows:
a.
Turn ignition On and check for a reading of 7.8 volts.
b.
Depress On switch and check for a reading of 12 volts.
c.
If voltage checks are satisfactory, switches and wiring are working properly. If voltages are not satisfactory, turn ignition off and proceed to
step 7.
7.
Disconnect ground brush from wiring harness, then connect an ohmmeter between white/purple and black wires at brush assembly pigtail. Depress
On switch and check for a reading of 0-1 ohms while rotating steering wheel throughout its full range.
8.
Connect an ohmmeter between light blue/white and black wires at brush assembly pigtail, then check for resistance values previously described in
step 4.
9.
If fluctuations occur in readings while rotating steering wheel throughout its travel, clean and lubricate brushes and slip rings, then install steering
wheel and repeat steps 7 and 8.
10.
If there is no resistance, replace ground brush assembly, clean and lubricate slip rings, then reinstall steering wheel and repeat steps 7 and 8.
11.
If resistance is correct and no fluctuations occur while turning steering wheel, ground brushes and slip rings are satisfactory. If replacement of
switch assembly and/or ground brush assembly does not produce correct values, check slip rings for shorts. If necessary, replace entire wheel
assembly, then repeat steps 7 and 8.
