Pinpoint Test A1 - Check Harness
With Ignition switch in the OFF position, remove leads from glow plugs. Check for continuity between the glow plug terminal and the power source with the glow plugs installed in the engine. See Fig 1. If okay, proceed to PINPOINT TEST A2 - CHECK HARNESS . If not okay, replace glow plug(s) and go to PINPOINT TEST A2 - CHECK HARNESS .