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jpnovak jpnovak is offline
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Join Date: Apr 2000
Location: Austin, TX
Posts: 9,108
CD unit woes - help me trouble shoot

I just got my engine running two weeks ago in my project. motor is a 78 SC RoW using the correct 6 pin CD. Now I have no spark. all contacts are clean.

The unit has the normal whine to it when key is on. Prior to this, the tach output did not work. When I checked I had no output on Td pin inside the box.

The dist. is putting out a signal. I get about 2.6 V(ac) when you spin by hand. I can even read the signal inside the box at the contacts.

The signal seems to be lost between the trigger input and coil signal output.

Is there a Bosch schematic for one of these 6-pin CD boxes anywhere?

Any suggestions for additional tests? Anyway to remove the guts from the box? it seems to be epoxied in place. Its not potted.


I searched the archives and found a great amount of information from Warren on the 3-pin but none on a 6pin. I assume similar tests can be done. Can I trigger this one with a momentary switch? I suppose I can continue to use the dist out of the case.

I hope someone can help since the car is ready to be driven.
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Old 07-13-2004, 01:05 PM
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