[diesel_mercedes] Glow Plug Question

 

When we last visited my garage queen 240D (1979) she wouldn’t start and I was busy checking the fuel system.  After verifying that fuel was indeed getting to the injectors, it was suggested I check the glow plug system (Thanks, Brian.)  Everything appears to be Ok but…with a fully charged battery (13.1v at the terminals) the glow plugs are only showing around 10.7 volts.  Will the plugs work at 10.7V?  Is this voltage drop normal?  If not, is the likely culprit the relay?  As a side note, a previous owner had retrofitted the car with the pencil style glow plugs (Bosch) and wired them in parallel.  As the ambient temperature in my garage for the past two days has been over 70 degrees I tried to start the car.  No joy.

 

-Don in St. Louis

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