Ok, thanks. Is the Hall effect sensor for the OM603 located on the
front of the engine with the magnet on crankshaft damper as on the
OM617/616?
The connector that attaches the tail from the sensor to the harness.
It's exposed and corrodes, resulting in poor transmission of the
signal (which is not voltage, but a pulse generated by the Hall
Effect pickup). The result is first an erratic tachometer/idle
speed control, followed by eventual loss of signal to the amplifier.
Peter
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