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| Our Troubleshooting Chart (in the General Tips Section) can be used to help isolate a hard starting problem with this engine even though the electronics make it unique. Once the diagnostics take you to an injection pump problem, then it should be removed and repaired by an authorized repair station, or if it's under warranty to your local GM Dealership. The glow plug system is a good place to start...below is a schematic of the glow plug system on the 6.5L engine with the steps you need to take. 1. Disconnect all Glow Plugs 2. Use a Test Light to measure continuity between each Glow Plug terminal and ground 3. Replace any burned out glow plugs as necessary 4. Reconnect all Glow Plugs 5. With test light connected to ground, probe each Glow Plug harness terminal connector 6. Command Glow Plugs "ON" Is test light "ON" 7. If test light "ON", system is operating correctly 8. If test light "OFF", check circuit 509 and 503 for an open wire
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