250 114 coil wiring needed ASAP - Page 2 - Mercedes-Benz Forum

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post #11 of 12 (permalink) Old 10-12-2005, 01:36 AM
BenzWorld Junior Member
Date registered: Sep 2005
Vehicle: 1970-200 1983-230e
Location: Malaysia
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RE: 250 114 coil wiring needed ASAP

Are you refering to the loose wire wite the connector?, This is the condensor wire and should bolt to the dist using the same screw used to bolt it in place. Looks like you have 2 (!!) possibly one is spoilt and someone just bolted on another ...
I would remove both and start with a new one (cheap and one less problem eliminated).. They're fairly common , it will have two wires.. one goes into the dist and hooks up with the points or ignition trigger. If your car has been modified with some other elec ignition it could be redundant.. anyway

As for the three wires... Sorry I can't help, where do they lead from?

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post #12 of 12 (permalink) Old 10-23-2005, 10:31 AM
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Date registered: Oct 2005
Vehicle: '72 250/8, '76 200d
Location: '79 300sd, 79280se
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RE: 250 114 coil wiring needed ASAP

The message from chrismalm rings a bell for me. My '72 250 has an electronic module under the battery tray(why such a hidden, potentially corrosive spot?). The coil negative does go direct to ground. I believe (its hard to see under there) that the module is also grounded, but I don't know for sure. THIS IGNIION IS DIFFERENT(MORE COMPLEX) THAN MOST OLD POINT TYPE SYSTEMS) The wire from the points that would go to the coil negative on most older points-type ignitions goes to this module.
I learned all this the hard way when my car wouldn't run, before I discovered the existence of the module. I cleaned the contacts on the module and the grounds mentioned, and she was goin' again. There are more than two wires to the module as I remember, but can offer no more detail at this point.
For general knowledge about contact point ignitions: The Haynes volvo 140 manual 1966-1974 page 93(mine is Haynes Publishing #ISBN 0 85696 129 9) has a eloquent but plain description the theory behind, and function of, breaker point ignitions-very thoughtful and quite Brittish. I wouldn't be supprised if Haynes used this same text in other old manuals.
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