As I remember, it bypassed the relay timer.
It would keep the plugs glowing after the motor started as well.
This helped cold weather starts too.
One other person that had done the same mod would flip the switch when he went through the drive through and found it quiter when he was ordering.
From: Lawrence Rhodes <primobassoon@sbcglobal.net>
To: "diesel_mercedes@yahoogroups.com" <diesel_mercedes@yahoogroups.com>
Sent: Thursday, January 16, 2014 9:32:04 AM
Subject: [diesel_mercedes] Auxiliary glow plug switch.
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