Yesterday I replaced the alternator/power steering drivebelt and air conditioning compressor drivebelt. When I started the car I have no interior power suchas dash indicators don't work, dome light doesn't work, windshield wipers don't work, power windows and locks don't work, signals don't work, speedometer and tach don't work, and when I start the car and drive it stumbles.

Last night I had the alternator tested and it was bad. I have installed a new alternator but it the same results as stated above.