Car refused to start yesterday morning. First time in 20 years! Anyway, popping a spare spark plug into one of the leads showed a reddish purple spark and I had a new ignition coil in my “in case of emergency” kit in the boot so set to swapping it out.
The ROM shows two leads to each LT post on the coil - on the positive side sure enough I had two.
On the negative side I only had one, but I did have small black wire connected to one of the bolts holding the clamp to the inner wing. Any other 4.0 owners confirm that’s the same?
Anyway, I wired the new one exactly the way the old one was and car started up (after a little cranking because it was a a bit flooded) and is driving great with the coil wired that way. Just thought the difference in the ROM was interesting.
BTW the old coil measured 22ohms on the primary and 7.1 kohms on the secondary when cold and probably worse when warm.