[427sharpe]

First: Make sure that the alt is grounded VERY well. Use a test light and check for power at the input terminal of the alternator. If power is there, hook a jumper wire between the 2 terminals on the voltage regulator marked B and F run the car and CAREFULLY check for power. If power is there when you charge the field terminal, you have a bad regulator. If no power there at all, a bad alternator. If you have power when you jump but not without the jumper, you have a break in the field wiring circuit. THIS PRESUMES THAT YOU ARE USING A FORD VOLTAGE REGULATOR AND THE OLD STYLE FORD ALTERNATOR! Any other questions, post and I will go thru more details with you. If you are running an idiot light, check to make sure its wiring is not broken as well.