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Here is how you can tell easily.
Open the door, turn the key to position II. When the glow plugs shut down the dome light will get brighter. It usually takes 30~45 seconds.
On my 300SD, I would glow twice - start once when the temperatures went below 32f. On the SDL I did the afterglow modification so I full cycle glow once, glow twice, wait for the indicator light to go out and start. The glow plugs will keep glowing until they time out. This has really helped smooth out the engine now that the morning temps are in the teens...
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"I have no convictions ... I blow with the wind, and the prevailing wind happens to be from Vichy"
Current
Monika '74 450 SL
BrownHilda '79 280SL
FoxyCleopatra '99 Chevy Suburban
Scarlett 2014 Jeep Cherokee
Krystal 2004 Volvo S60
Gone
'74 Jeep CJ5
'97 Jeep ZJ Laredo
Rudolf ‘86 300SDL
Bruno '81 300SD
Fritzi '84 BMW
'92 Subaru
'96 Impala SS
'71 Buick GS conv
'67 GTO conv
'63 Corvair conv
'57 Nomad
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