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Home >> GMC >> 1985 >> S15 Jimmy 2.8 B, RWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - 2.2L Diesel >> Testing >> Glow Plug System >> Glow Plug Relays
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Glow Plug Relays

No continuity should be present across terminals "C" and "D". With battery voltage applied to terminals "A" and "B", continuity should be present across "C" and "D". If not, replace relay. See Fig 1 .

Fig 1: Glow Plug Relay Testing
G9762