Yep! If you have never removed the alternator from an old XJ before, let me tell you that it ranks about an 8 on the 10 scale of
suckiness ! There is *no easy way* to get to it. You have to start taking things off and out just to access the blasted thing! Had every service manual that I own spread out around the garage like a library trying to follow diagrams. After the thing was finally out, I took it to the auto parts store to have it tested, just to be sure. Once it was on the dyno, we found out with all certainty that it was
toast ! So, I spent my York Fair money (and then some) on a new alternator. FWIW, I think it measured 4 3/4" across. It looked exactly like the replacement one that they sold me. Hopefully, it will fit!
On a lesser note, the coolant bottle was leaking and almost empty again, so it was Billy Mays' Mighty Putty to the rescue there.