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Check the condition and tension of the alternator drive belt. Have a test done on the alternator as it appears that there is insufficient current to cover the large current draw for the lights.
DID YOU REPLACE THE BELT COULD BE A LITTLE WORN WHEN AC COMES ON IT PUTS TOO MUCH STRAIN ON BELT THEN IT SLIPS. OR YOU GOT A BUM ALTERNATOR OR BATTERY.TAKE IT TO AUTOZONE THEY WILL PUT ON THE MACHINE FOR FREE .
Sounds like a charging system issue. Just because the alternator itself tested fine doesn't mean it's getting power to the car and battery. Charge the battery and start the car (with everything connected normally, including alternator). While car is idling, disconnect the battery (negative post wI'll do). If car dies, there's a problem with the alternator wiring/harness. Once the vehicle is running, the alternator should provide plenty of power. Check voltage at battery (from alternator) and should be around 14V. Check alternator fuse. Could be the voltage regulator in the alternator going out, which would need a new alternator.
have your alternator output checked. its a good idea that they check it while the light is ON. If they check it while the light is OFF, it may not show any problem.
I would look at the alternator. I had a grand am that would do that to me, even with a brand new battery. The alternator output wasn't able to run the vehicle and charge the battery. Alternators are picky things, especially being in Canada (which I assume from the KM), the hot and cold cycles don't play nicely with the brushes and core. I'd have the alternator checked and replaced if needed.
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