The glow relay turns off the glow plugs on all engines before the 60x series. If you have any of the 61x series, it turns them off when you hit the starter. IF you have a 60x series, it will allow the glow cycle to complete before turning off the plugs.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM