Had the alternator checked and tried two differant alternators. I checked the ground and all connections, but I am not charging. For the last few days my voltage was fluctuating from 9 volts up to 15 volts randomly. All of a sudden it droped down to 9 volts and will not start charging. The yellow wire to the alternator shows battery voltage when ignition is on. The tan wire shows nothing. There is good continuity from the terminal on the alternator to the battery. Everything I can find shows the only thing left to ccheck is the alternator, but it tests good. Please help me!