Glow Plugs

The glow plug system used a pre-heating timer and 2 relays to control glow plug current. The glow plugs enable the engine to start easily in cold weather and run smoothly during warm-up. Current is applied to the glow plugs for a specific time which is determined by engine coolant temperature. When the ignition is turned on, a glow plug light operates for 4.5 seconds if coolant is below 104°F (40°C), or .5 second if coolant is above 104°F (40°C).