Hahahaha… Just one of those things I guess…
I will go back to the other thread (I didn’t see it because the hood of my XJS swallowed me today) but I “solved” my problem. I found the “Diagnostic Socket”. It’s the large black connector looking thing right behind the master cylinder and reservoir on the LH side. Big ol thing.
I saw a Marelli amp on eBay a few weeks ago and it was new, so cheap, I just bought it. I replaced the one on the car today due to the fact that my problems were showing up in the tach which is associated with the A Bank parts of the ignition system. Worked BUT, I have a feeling that the reason for the failure of the original amp had something to do with an electrical issue within the wiring of the ignition system under the hood somewhere. Although I wish I didn’t have to I’m compelled to go tomorrow morning and completely cut open the ignition wiring as far back as I can go in the engine back and see what I find. I learned today, and with the ED that it’s actually not so complicated a thing after all. At least not physically. Electrically, well that’s a whole other story…
The wiring didn’t look old, dried or cracked at all. The plug associated with the A Bank was a little corroded and unclean, I cleaned it up and plugged it back into the new amp. Then, rewired the plug for the CTS just because and built a new plug for it.
Idle smoothed right out - but as I’ve been told, if it’s toooo good to be true, it’s prolly not true.
I appreciate y’alls responses. Let me go back and see if I can find the replies to the other old post I woke up on the issue.
Deep bow, many thanks.