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Bronco, Pickup & 1991 Van

  1. Unplug 6-pin connector at amplifier. See AMPLIFIER LOCATION table under REMOVAL & INSTALLATION. Check for battery voltage at circuit No. 151 (Light Blue/Black wire) with speed control ON switch pressed. If battery voltage is present, circuit is okay. If battery voltage is not present, go to next step.
  2. Check for continuity between Light Blue/Black wire and ground while pressing speed control OFF switch. If resistance is greater than one ohm, wiring to steering columns, slip rings, or switch is at fault, or steering column may not be properly grounded.
  3. To check steering column ground, measure resistance between ground and steering column upper flange. Resistance should be less than .5 ohm. Rotate steering wheel to check flexible coupling. If resistance is greater than 3 ohms, clean horn brush contacts and ground brush.
    NOTE: Before performing following steps, ensure resistance between steering column and ground is less than one ohm.
  4. With ohmmeter connected between circuit No. 151 (Light Blue/Black wire) and ground, press and hold SET-ACCEL switch. If resistance is not approximately 680 ohms, replace switch.
  5. Press and hold COAST switch. If resistance is not approximately 120 ohms, replace switch. Press and hold RESUME switch. If resistance is not approximately 2200 ohms, replace switch.
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