Alternator not charging

Hi Danny.

Okay, these pictures aren't accurate the vehicle in question is a 2004 Mercury Saber. The alternator is located on the bottom of the motor back by the fire wall. Access to it is all most impossible unless you take all the stuff that sets on top of it. Okay, now for what has been done all ready. So far 2 reconditioned alternators have been replaced. The original replacement failed the test at O'reillys auto parts where the alternator was purchased. Now the second alternator was bench tested and passed. The second alternator was replaced and the battery will stay charged some times and it will drain down some times. If I could find the field wire. Up on top some where I could make a test. I can't find a wire diagram to help me. In fact I can't find any assistance on this car.

Hi again.

I will have to agree that new is better. However, the wife bought it and had installed by a friend who has a shop with a lift. He did both alt installs. Now i'm left wit trouble shooting the side effects of these installs. I don't have the a voltage leak detector so everything will have to be done with a test light and hand held voltage meter. Thanks for the wire diagram. I wont be removing the alternator if it has to be replaced the same fellow will do it. Now it has been brought to my attention that the cars computer may have to be reprogramed or reset to the factory settings. I have never heard of such a thing. But i'm an old school mechanic with little or no modern electronics to help me out. So i'm stuck with my freddie flintstone diagnostic tools. Being test light and jumper wires. Ill wait for this to be answered. Now I get to see why the car runs like shit, checking coils and spark plugs. Got to love it.