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Hello
Yes the Bosch CD unit has the ABC out plus the seperate ground.
The Output from that Box is send to a "coil" and transformed from 500 Volt to 50000 Volt.
If you use a standard coil they mostly run on 12 Volt or on 9 BVolt ( High performance )
The system "might" work with a normal coil for a while but the CDI transformer will not work in combination with a normal ignition. I never tried it as the CD unit maybe will not survive it and this is to big $ to test it even on my own car.
To prevent people mix up the systems the contacts ( terminals ) have differnt markings depending on the system.
To make it simpler:
On the CD Box:
A is Voltage out to the A contact on the transformator
B is 12 Volt input on the Box
C Input from the breaker contact
On the Transformator:
A is the incoming spark from the CD unit
B is GROUND
It is absolue important that the CD box and the Transformator have good ground and it is important to have the A wire shielded with the ground to the CD box as 500 Volt with some Millijoule behind it can kill persons.
Grüsse
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