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Originally Posted by Jim H
So, the GP relay appears to get separate RUN and Cranking signals. The M-B engineers do not elaborate what is inside the 'black box' but there could well be internal logic that keeps the GPs energized during cranking and drops the relay when cranking stops.
This could be easy to test with a voltmeter during cranking.
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Yes, the relay gets separate run and cranking signals. But, if the plugs are to remain on during cranking, and then shut down during run, there has to be some really sophisticated logic in the relay. When you turn the key to position II (run position), the plugs come on. If you turn the key to position III and the plugs remain on (per your scenario), how would the relay know to shut the plugs down when the key is returned to position II??
I suppose that it's possible that the relay will trigger when it gets the start signal..........then it will shut down after the trigger when it gets the run signal. It would be quite a complex relay to accomplish this.
I think I'll do a little check the next time I start the 603 and see what the scoop is.