Change alternator belt in a mazda mx-3 - 1992 Mazda MX-3

either drive belt too too big or drive belt tensioner broken or drive belt need adjustment if you have v type belt.

Has the battery been load teseted?

LOOSEN ALTERNATOR MOUNTING BOLT THEN LOOSEN ADJUSTER BOLT IN THE ALTERNATOR TOP BRACKET.THAT WILL GIVE YOU SLACK TO REPLACE BELT.

You would begin by first removing the negative terminal of the battery. Then tuck the terminal in some area, so it won't flip back.
2. Unplug the alternator electrical connector, and remove the wire bolted to it.
3. Locate the adjuster bolt and nut, loosen both of them to the bearest minimum position, and push sideways to slacken the alternator belt. Slide belt off the pulleys, and take it out.
4. Locate the alternator pivot bolt, and loosen it and remove it.
5. Loosen the upper holding bolt of the alternator, and remove that as well.
6. Gently take out the alternator.
7. The alternator could be exchanged for a rebuilt one at any autoparts store.
**Important: Battery must be fully charged before installing a new alternator.
8. Reverse this procedure to install the new alternator belt.

i would have the timing belt checked

if the belt that is missing is on the passenger sidde of the vehicle this is the drive belt and probably the one that drives the alternator that is why the battery light is on.

labor 150 used alternator 50 new alternator 120

VSS or vehicle speed sensor aka cam sensor or crank position sensor. Test the battery and alternator. You should also check for blown fuses, bad wires and grounds on a car as old as yours. If you find it's getting spark and fuel after further testing, check the timing belt. It could have slipped or broke even if it was changed recently so either pull off the cover or at least do a compression test.

there is one large bolt 13mm i think near the top and the tensioner on the side. just loosen that baby and push the alternator and take off the blet

check that with the belt off you can turn the pulley on the alternator by hand this may be a bit seized and cause the belt to break.
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