After a week of testing out the battery and starter, I am still struggling to get my 1979 240D to start. The starter is rebuilt (by a reputable local shop) and the battery is new.

Still no start.

After this whole ordeal, as well as testing and rewiring the GPs, a proper 50-amp fuse installed (the PO had pencil style GPs, old wiring, and no fuse), and cleaning ground wires, no start!

After attempting to start I go under the hood and notice there is absolutely nothing happening with the GPs. I can touch them; they are not even warm. I've tested for continuity, but when the key is in the ignition to glow the plugs, there is a most 1-2 volt current in those plugs.

What else can I troubleshoot? I'm starting to pull my hair out, especially considering it had no problems before I changed GP wires, added a fuse, and put in new return lines.

Mercedes Diesel Glow Plug Repair or

Mercedes Diesel Glow Plug Repair

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2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)

As I mentioned in your starter solenoid thread, check your engine ground strap. If your engine is not bonded to the battery negative, you will not measure any voltage at the glow plugs due to an incomplete current path.

You can test the theory easily enough. Turn the key to preglow and measure voltage from the glow plug terminals to the battery negative post. If you measure voltage there, but no voltage from plug to the block, you have no connection between block and battery.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Great "K.I.S.S.Advice/tip there .

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-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better