Advantages of dual ballast over single??

skykeith said

The dual ballast resistor is for the systems that have the 5 pin ignition module. You'll have to see whether you have a 4 or 5 pin module and wire it accordingly.

Click to expand...

To simplify further (I hope) the 4 prong ballast MUST be used with a 5 prong ECU

A 4 pin ECU can be used with EITHER a 2 or 4 pin ballast.



The resistance of the two halves is different. One half is same as 2 pin, hooks up to coil as it always did.

Second half of 4 pin resistor is used INTERNALLY in the 5 pin ECU box