I have a problem with my 2001 Ford Escape 3.0L V6. I bought it without a working engine. The old engine had a brand new alternator on it. When I had the shop replace the engine, they took the alternator off the broken engine and installed it on the new engine. When I picked it up at the shop and was driving it home, I noticed that the headlights were dimming, then going bright, then dimming etc. and the battery light ont he dash was doing the same thing in time with the lights. All electrical in the car was doing the same thing fan, dome lights etc. The engine was running great however. I got home, checked the voltage going to the battery and it was all over the map. Figured the regulator was out of the alternator so I replaced the alternator with yet another brand new one. To my suprise, it was still doing the same thing so I replace the battery with a new one....still same problem. When I start it in the morning, it does the same thing everyday, after driving it for 5 to 10 minutes, the battery light and electrical stop pulsing. Anyone have any suggestions on what might be causing this problem?