I had a 1977 240D that I rigged up with a toggle switch connected to I think the violet wire going to the glow plug relay.
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.
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.
Mark
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.
I have found that working glow plugs make a huge difference in starting a diesel. Sometimes just a little more time is needed. You can do this with double starts which means running two start cycles. Another method which on one car became the normal method was to put in a manual glow plug switch in. This includes a simple automotive relay you can buy at a parts store for under 10 dollars or take one from under the hood of just about any car in a junk yard. Very simple. Two connections of the four or 5 terminals are the activation circuit. Two others(usually the big ones) carry the current to the glow plug circuit.(a circuit in electrical terms can be as simple as a battery, switch and light bulb with wires connecting them together.) You hook a direct connection from your battery to a fuse, then the relay, from the relay splice into the glow plug circuit. Then you have to connect the activation circuit using a momentary switch. I found the pin in the circuit that activates the glow plug light so when I push the switch the glow plug light illuminates. I believe I have documented this somewhere on the this lists website so look for the pictures if you are interested in this modification. I count to 5 normally. 10 in winter. Lawrence Rhodes.........
http://groups.yahoo.com/group/diesel_mercedes/photos/album/899645931/pic/list my modification of a series model 1977. Requires using different glow plugs that ground.
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