Chuck:
Sorry I took so long - couldn't locate the manual. How is it wired from the pre-resistor reading 9v to the 4.5V at the coil? When I used the stock Bosch coil I went from the .4ohm to the .6ohm directly to coil (+) and I was getting 10.25V. Using the Crane coil and their resistor I get 11.25v at coil(+).

Check the resistance of each resistor and, even though it is new, if you have the correct coil it should read .35 - .45 ohms between the terminal (#1 and #15). You say the CD unit is completely out of the loop - double check to make sure you don't have a brown or black wire running back along the bottom of the fender well to the .6ohm resistor. If you do, the CD unit is not completely out of the circuit and that is a problem for the Crane Unit.

Another item, the Crane control box can get warm when then engine is running. WARM - like tepid water. If the unit gets HOT then it is receiving too much current - most likely a problem with the resistor(s)or coil resistence. When I talked to the Crane tech the one thing he cautioned me about was that the control box does not like to get hot and it is easily damaged.

If you can get at least 9V to the coil (+) you should have plenty of spark.

Hang in there..

Dan

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Dan Taylor/ Tulsa, OK MBCA
'84 300D/'90 Jaguar XJ6/XJ40