Quote:
Originally Posted by funola
Are you sure about that (glow plugs on while cranking)? Logically, one would think that Mercedes, by using good design practice, would put a relay in the circuit to cut power to the glow plugs while crranking in order to deliver full power to the starter.
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One would think that Mercedes, using good design practice, would incorporate a battery perfectly capable of powering the entire start system, which includes the starter
and glow plugs.
Quote:
Originally Posted by funola
Looking at a wiring diagram tells you nothing as to how the glow plug relay operates in regards to the purple wire.
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The purple wire is hot in the "start" position. The wire goes "cold" when the key is released from the "start" position; that signals "start complete" to the timer, which terminates the glow cycle. In the absence of the hot/cold sequence, the timer "times out" as if no start was attempted. (Not applicable to afterglow systems.)