My 82 300D is hard to start. The glow plug light never comes on but I do get twelve volts at the plugs until the reley shuts it off. Any ideas??

You should post this question over in the Diesel forum on this website......

Your problems could be caused by several things......

Are the Glow Plugs reasonably new? Do they have electrical continuity, plug electrical connection to block/head??

It could be low compression.....

Have you checked your "valve lash lately???

And what are you using for fuel.....?? Fuel Filters????

The guys over in the Diesel Discussion will want more info.....like mileage on the engine.....

SB

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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG