Glow Plug Control Unit

To test pre-glow operation, connect test lamp to Blue wire of control unit (harness connector plugged in). Turn ignition on and measure amount of time test lamp is lighted. See PRE-GLOW TEST SPECIFICATIONS table.

PRE-GLOW TEST SPECIFICATIONS

Coolant Temperature: °F (°C)	Time In Seconds	Terminal Voltage
Below 122 (50)	12	8
Below 122 (50)	6	10.5
Above 122 (50)	0	0

AFTER-GLOW TEST SPECIFICATIONS

Coolant Temperature: °F (°C)	Time In Seconds
Below -13 (-25)	31
68 (20)	11
104 (40)	5
122 (50)	0

To test after glow operation, connect test lamp between the Black/White wire and White wire leading to control unit. Measure amount of time that test lamp is lit when ignition switch is turned from "START" or "OFF" to "ON" position. See AFTER-GLOW TEST SPECIFICATIONS table. Test lamp will be on continuously with ignition switch in "START" position.
Test lamp will turn off during after-glow operation when glow plug voltage reaches 7 volts. Replace glow plug control unit if defective.
To test glow indicator, connect a test lamp between "Orange" and "White" wires leading to grow control unit. Lamp should remain lit for approximately .5-6 seconds.