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d. Set multimeter for ohms and test heater, (glow) plugs. Normal reading is 4 to 5 ohms. Zero resistance indicates ashorted heater and a high reading indicates an open heater. You have to remove them, to test them. When you have a problem, use the troubleshooting diagram. And don't forget...

The reason it turns over better with S-10 is because S-10 ONLY turns the starter over. All the other functions needed to start and run the set are blocked out.

Indeed, this has the classic sound of bad glow plugs, and maybe low batteries. The clacking in the first few seconds of starting are low battery sounds. As commented, the clattering sound comes from the fuel cut off solenoid engaging and releasing, due to low batteries. The second time you...