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1988 944S Slow engine cranking

Electrical

Vehicle Information: Model(924/944/968): 944S; Year: 1988; Body Type: Coupe; Total Mileage: 182000KM;

My 944S is really slow to turn the engine when I turn the starter on.The symptoms are the same as a low battery (really low) at the point the engine stop turning after 1/4 of turn not even.The battery has been tested, replaced I even tryed to boost the battery with an other running car but still the same symptom.I suspect a faulty ground connection or a defective starter. The starter does not seem to have enough torque to turn the engine.I have removed the sparkplugs and try to start. the engine turn "freely" but really slow.I have started and runned the car on feb 01 2005. it's started fine.The 944S is in my small garage and I can't take out right now to work on it. Soon as there is no more snow in my driveway i will bring it out to jack it and look at the starter.Any ideas? Any suggestions about the ground connections location?

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