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Originally Posted by inetd
Yea, I'm pretty sure. I've looked it up twice from two different sources and both say 10ms impulses @ 5V to trigger the coils on top of each plug. But I wouldn't know for sure.
I'm going to go down and measure it here and let you know. Alldata shows more than one terminal on the coils? I've got one in my hand and there's just two wires going into it. Was that for an older motor? I think the 560s and older V8's were 2 coil systems, and had "real" plug wires unlike the 119 motor...
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I checked again for the 98 S500 ignition coil wiring using Mitchell On-Demand instead of Alldata and came up with battery voltage supplied to pin 3 (yellow/green wire), ground supplied via engine computer on pin 1 (black/xxxx wire), and pin 2 (brown wire) permanently grounded on left and right sides of engine. Pin 3 constantly supplies one side of primary coil with battery voltage, while pin 1 grounds the other side through the computer controlled drivers. Pin 2 supplies ground for one side of the secondary coil, while the spark plug supplies ground for the other side.
I'm thinking the computer is providing the 5V pulse on the ground side of the primary coil during dwell to create a voltage drop of around 9-10 V across the coil.
03-06-2005, 12:08 AM
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