LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Plymouth >> 1978 >> Arrow Base, Automatic Trans >> Repair and Diagnosis >> Electrical >> Body Electrical >> Speed Control Systems -- Automatic >> Testing >> Speed Control Switch
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Speed Control Switch

  1. Disconnect 4-wire connector at steering column. Connect a 12 volt positive source to black wire terminal in speed control harness connector (male). With switch in "ON" position, connect a test lamp between connector yellow wire and ground. Lamp should light and then go out when "SPEED SET" button is depressed.
  2. Move test lamp lead to connector blue wire. Lamp should light with switch in "ON" position and go out when switch is turned to "OFF" position. With switch in "ON" position, move test lamp lead to connector white wire. Lamp should light by either depressing "SPEED SET" button or by moving switch to "RESUME" position.