The glow plug light come on when I turn the key on and then it goes off but will not start so i kept reading through all of the post here and went and had the battery tested and it tested bad. so I have to start with a new battery but the glow plug light blinks sometimes when I am driving. So I am assuming I need new glow plugs. I will keep searching on the other items as well. Thank you guys for all of your help here.

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1st time Mercedes Owner.
1980 300D 123/130
what do ya expect for $600.00
Needs TLC