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Old 12-22-2014, 12:47 AM
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Join Date: Nov 2014
Location: Louisiana
Posts: 57
HELP 380sel mystery green coil wire

Can someone please tell me where this lonely green wire I found disconnected on the 380sel I bought last week that won't start. It looks like it has a new coil. It wasn't running when I bought it and previous owners were throwing parts at it. I'm thinking they forgot to hook this up when they put the new coil in. I'm not sure where to connect it or if even to connect it to the coil. The coil has a positive and negative post and I would guess it goes on the neg post, but I don't want to burn something up. Does anyone have a diagram? I'm in desperate need to get this started! It did start for a second the first time I looked at it before the purchase. As soon as I barely touched the gas petal it died and haven't got it started yet!!!
Here's a pic below and I forgot to mention the car is a euro spec and has a "k-loop"

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HELP 380sel mystery green coil wire-image.jpg  
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Old 12-22-2014, 08:56 AM
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Join Date: Jan 2003
Location: Matthews, NC
Posts: 1,356
NOJDOG, on my 84 500SEL US car the green wire hooks to the negative side of the coil and runs up to pin 4 of the diagnostic connector. Being disconnected will have no effect on the engine running.

Start with the basics:

Plugs firing. Check at one of the plugs.
If good
Check for fuel pressure. Not easy on these cars without special gauges.
If good
Check for fuel at the injectors by removing an injector and checking while starting.
if good
Check compression.
If good
Check timing with a timing light
If good
Check for plugged exhaust.

If you make it here, it will run

If you come to a Not Good, let us know and we can try to help.

84 500 SEL (307,xxx miles)
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