The Ignition Sequence Trigger Wire for the PreGlow ReLay?
OR
The Hot at All Times POWER feed?

On the W124 Chassis the Hot A.A.T. POWER feed runs from a Positive Buss
in the Left hand side Kick Panel of the Driver's Footwell.

(I understand how the Engineers routed the Cabling the way they did,BUT NOT
why they didn't use a Dedicated Cable Feed for the PreGlow Relay Directly from
the Battery.The Cable that feeds the Sub Panel Positive Buss is not as large as
the Cable from the Buss to the PreGlow ReLay.)

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'84 300SD sold
124.128