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Involuntary Height Variation

  1. Inspect for defective control unit circuit, height control circuit or faulty control unit. Turn ignition on and measure voltage between control unit terminals No. 31 (ignition) and 20 (ground). If less than 10 volts is read, repair wiring in terminals No. 31 or 20.
  2. If over 10 volts, measure voltage between terminal No. 29 and ground. If less than 10 volts is read, replace control unit. If over 10 volts, replace height control switch or wiring between switch and control unit.
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