Gotcha! So if the violet wire is continuing to get power once the car has started and the key is released allowing it to return to the "Run" position, the issue likely lies in the ignition switch. If the violet wire is no longer energized, that points to the relay, correct?

Any other tips on this issue to keep me going in the right direction?

Thanks for sticking with me on this.

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Pictures of the MB: http://s230.photobucket.com/albums/ee41/EricandRobyn/1981%20Mercedes/

1981 300 SD with a Goldenrod water block and Injetor line heaters. EGR is missing

1999 F-350 with HP X-over, Dahl 100 Fuel Filter, Coolant by-pass filter, CCV mod, Tymar intake.

Both on single tank WVO blend