1998 Mazda MVP diagram of the 3 belts

I hope help you d
this diagram,

You need the routing diagram for the a/c belt on this 1998 Honda CRV


here is a diagram of all three belts, this one is simple , the ac belt just goes around the pulleys. hope this is helpful good day

This is from the Owners Handbook :
Alternator Drive Belt.
1. Loosen the alternator mounting bolt and adjusting bar bolt. Replace Fanbelt.
2. Turn the adjusting bolt until the correct tension is obtained. The deflexion should be 10mm.
3. Tighten bolts and recheck the tension.

Read more: http://wiki.answers.com/Q/How_do_you_replace_fan_belt_on_1997_Mazda_323#ixzz1yS0LNtO5

draw a picture of belt run before you take it off .unless you have taken it off and forgot how it went already in which case answer this and i will look in my alldata book for you

Click on the following free direct Link. It has several Diagrams including the correct Serpentine/Drive Belt Diagram for your 1998 Mazda Millenia based upon your Engine Size and unspecified Engine Options.
Included are Instructional and Directional Diagrams on the locations of the various Adjustment Bolts/Nuts which will have to be loosened in order to remove the Belts; and tightened in order to reinstall the Belts.

http://www.2carpros.com/car_repair_information/year/1998/make/mazda/model/millenia/1998_mazda_millenia_drive_belt_routing_diagram.htm

Don't know your engine size so pick the appropriate one:

MPV Models 2.6L ENGINE
Fig. 2: Alternator installation — 2.6L engine

1. Disconnect the negative battery cable.
2. Tag and disconnect the wire and connector from the alternator.
3. Remove the drive belt.
4. Remove the support mounting bolt and nut.
5. Remove the alternator assembly. To install:
   
6. Position the alternator assembly against the engine and install the support bolt.
7. Install the adjusting strap mounting bolt.
8. Install and adjust the alternator belt.
9. Tighten the support mounting bolt to 28–38 ft. lbs. (38–51 Nm), and the adjusting bolt to 14–18 ft. lbs. (19–25 Nm).
10. Connect all alternator terminals.
11. Connect the negative battery cable.

You may have to buy a new belt because that one may have stretches. After you buy a new belt. Look at he alternator, it has two screws, one hold it in place and the other allow it ti move. Lose both a little. With a pry bar push the alternator so the belt can fit. Look for the belt routing diagram in the engine compartment. Follow it and put the belt on. You were suppose to have a belt tension tool to determine the tension. Then use your pry bar to move the alternator to position and tension then tightened alternator screws.

Here's the page from the AutoZone online manual for replacing drive belts.

Simply check is to replace the serpentine belt tensioner. Looks like this:
http://www.1aauto.com/1A/SerpentineBeltTensioner/Mazda/Pickup/1AEBT00008/975584/1/?utm_source=google_base&utm_medium=cpc&utm_campaign=google_base_api
Another reason you might have alternator going to die. Try to rotate the alternator rotor without belt on it. If you need to use force no free rotation, replace the alternator.
Please kindly let me know if you need more info
Good Luck

Go on the Dayco belts web site. They make serpentine belts and a pretty good data base of belt diagrams for any vehicle they make a belt for.