Make sure the battery cable connection on the starter is good, too -- if it is corroded or loose, you will have current to the solenoid but not the starter winding. This happened on the Volvo, and I was ready to replace the starter when I found the nut already loose -- cleaned it up and off it went!

It will be worse cold, since the nut will be looser.....

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!