Thread: 1973 911
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The cap'n The cap'n is offline
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Join Date: Nov 2001
Location: Santa Maria, CA
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That "blocky looking thing" is a resistor, used with non-internal resistor coils. The coil is wrong for the car, as is the resistor. The Bosch CDI units do not like conventional coils, they use a special transformer (which looks like a regular coil). Conventional ignition coils often damage the CDI unit, shutting down the spark.

The Cap'n
Old 11-23-2014, 03:13 PM
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