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So I have a 2003 Beetle with a 1.9L diesel. Drove it to work fine (40 miles). There were no signs of trouble. Went to start it at the end of the day and it won't turn over. Dash lights up when I turn the key to the on position and the coil indicator light functions normally. When I turn to ignition the starter engages and it sounds like there is a lazy half turn of the engine before it cuts out. Seems like there isn't enough juice to get a good crank. I assume a dead battery of course. I try to jump it and it isn't helping. Fortunately I live and work right on a commuter rail line so I leave the car in the lot over night.

Next day I put the battery on a charger at my desk, let it go all day. I try again when I am leaving the office and the same thing happens.

The next day I have the local battery shop drive over with a new battery and still, it's the same thing.

The starter is clearly engaging but it seems like it doesn't have the power to turn it over. Maybe I'm wrong, but this doesn't seem like the way a bad starter would behave. Terminals are clean. Admittedly I have not checked the starter connections.

Anyone have any idea what this might be?
 

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Some time back my tdi wouldn't wrench. I held up a couple of moments and afterward it began. I looked into here on this site and chose to erase egr cooler. (I likewise cleaned the admission) I kept the egr valve on without vaccuum line and a few times it wouldn't begin. So I opened hood and turned the butterfly valve...it would begin at that point. I at last did the egr valve delete...thought issue tackled. It wouldn't begin again...wait a short time then it would begin. I changed out fuel channel and T fitting on top. Recently it wouldn't begin to return home from work. I wrenched it a LONG time...never would begin and had towed to technician (great repairman) The following day specialist began it straight up. He is going to look at with PC. I noticed one time when it wouldn't begin I associated OBDII and it wouldn't interface until it would begin once more. No codes other than the gleam plugs I definitely think about. To me it "feels" like it isn't getting fuel. I haven't broke injector lines yet. Any thoughts?

Much appreciated.

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There is a short thick copper wire on the starter itself about 3” long that runs from the solenoid attached to the starter to the starter body itself. Those copper wires deteriorate over time and cause problems. Poor connections and such. A test is to jump the starter directly to the battery and bypass the solenoid. If the starter turns normally then the solenoid or that wire is bad.
 
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