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Old 09-15-2004, 12:50 AM
MunichTaxi MunichTaxi is offline
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Join Date: Aug 2004
Location: Western Washington
Posts: 504
Excessive cranking, ignition module (Switchbox)

So, by excessively cranking a 'dufficult start" engine, one could fry their Switchbox. That makes sense for the W108.

There are 2 ballast resistors at 0.6 ohm and 0.4 ohm, and the shop manual states the 0.4 ohm is bypassed for cranking. So, the engine 'runs' from the 0.6 + 0.4 ohm ballasts.

Experiment #1: Wonder what the result is of replacing the 0.6 ohm with a 0.4 ohm? Total resistance would be 0.4 + 0.4 + 0.4 (coil)= 1.2 ohms

Manufacturer resistance is 0.4 + 0.6 + 0.4 (coil)= 1.4 ohms.
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1970 280S M130 engine- good runner
1971 250 M130 engine- #2 rod bearing, gone
1971 280SE (blown engine,parts car)
1977 German 280S W116-only 33 years old
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