Hi people!

My old GW has become impossible to start without running the diesel heater.

The engine was swapped from an M110 to a OM617 in the 90s. The glow relay is manually operated using a switch.

While glowing, am I correct you should feel the plugs becoming hot to the touch? Cause they remain ice cold.

From what I know, if one fail, they all stop glowing (being connected in series). I then measured using a voltmeter between ground and each of the glow plugs, and got solid voltage on all of them. Is it possible to read good voltage on a busted glow plug?

Thanks for any insight

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1985 W460 300GD OM617.912 w/ STT turbo (ongoing OM606 engine swap)
2011 W212 E220 CDI