You could check out my thread on the Extended Idle Switch install. I got one off a parted out Police XJ that was rolled. I got all the factory connections, and the full run of wire. This way I can de-install it for another XJ later. In the meantime, if the stock one is adequate, I can live with that. Is there an accurate way of checking the output to verify its total amperage? I had it tested and during the test it was run up over about 1200rpm, but it wasn't "loaded", in other words, I didn't turn on lights, accessories and such to see if it kicked up the output, which is regualted by the ECM if I am correct? I guess I will go with putting on a new belt, and tightening the hell out of it. Mine isn't real loose, but I don't want to take any chances. I also don't know when mine was ever replaced, and the XJ has 227k on it now. Should I go ahead and replace it anyways? I just don't want to take it out, take it to the parts store, test it, it shows good and then I have to go and re-install it again. I want to do this once and once only, and I didn't know if there is an easier way to do that. Oh, and sorry about the year 5-90, I didn't think that mattered a whole lot. I knew there were differences, but I didn't respond to that one correctly. My bad. Thanks and keep the suggestions coming. By the way, most parts stores want $120+ for a rebuilt one, and I figgered the Mean Green units were maybe better than a parts store rebuild. Thoughts here? Also, all the XJ's had the built in part for the Extended Idle, there is just no actual circuit in the fusebox, and the firewall grommet for the wires, but the actual wires are still there in the ECM harness, which is where the actual connection is going to be made. I will show you once I have the install completed.
Jeff