davidcwhitney
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My first W115, 4-cyl petrol engine. The car was manufactured for the U.S. market. There are two ballast resistors with 0,4 and 0,6 stamped on their brackets. I assume these are resistance values in ohms. Actual resistance is 1.4 and 1.6 ohms, respectively.
No reference work I can find tells me which resistor comes first in the wiring sequence. My spark is weak and the old wires have additional resistance, so I'm going to replace the entire mess but need help determing the sequence of wiring. Does anybody know the max allowable voltage to the coil to avoid damaging the points? I know min is 5v, and I'm looking for a good, healthy spark.
In addition, the car has an ignition control unit below the battery tray, so there is no wire directly from a ballast resistor to the coil. Do these units ever go bad? Can they be tested? How much voltage do they want coming in? None of my references discuss this part but the wiring diagram is quite clear.
Last, but not least, I have not succeeded in making the engine idle yet so can't set the dwell on the new points. Does anybody know what the point gap is that corresponds to the correct dwell angle so I can at least set it close and adjust later?
Thanks,
David in California
No reference work I can find tells me which resistor comes first in the wiring sequence. My spark is weak and the old wires have additional resistance, so I'm going to replace the entire mess but need help determing the sequence of wiring. Does anybody know the max allowable voltage to the coil to avoid damaging the points? I know min is 5v, and I'm looking for a good, healthy spark.
In addition, the car has an ignition control unit below the battery tray, so there is no wire directly from a ballast resistor to the coil. Do these units ever go bad? Can they be tested? How much voltage do they want coming in? None of my references discuss this part but the wiring diagram is quite clear.
Last, but not least, I have not succeeded in making the engine idle yet so can't set the dwell on the new points. Does anybody know what the point gap is that corresponds to the correct dwell angle so I can at least set it close and adjust later?
Thanks,
David in California
