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Short answer: Watch your volt meter in the dash.

Glow plugs create a huge draw on the battery (50-100 amps). Most GPR's stay active up to 2-3 minutes maximum. When the GPR is activated the battery volt meter will be towards the discharge side or read around 11 volts @ idle, (Higher if the engine RPM is increased). When it turns off the volt meter will rise above 12.5 volts then slowly make it's way to 13.5/14 volts to normal,....maybe 1-2 minutes until normal.

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