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Removing either battery cable, thereby taking the battery out of the circuit, with the engine running can cause the alternator to charge full tilt and destroy sensitive micro volt (computer controlled) components; and I've seen wiring harnesses go up in flame from it. You may have a module problem.
well normally the manufactures would list a battery type in your manual or the manufactures of the battery has a catalog with the different vehicles and the recommended battery..
things to check..
1.) look for a surface discharge meaning that some stuff on the vehicle is pulling more power than it should or some device isnt shutting off properly, like the trunk light or door lights etc..
2.) check that the alternator is pushing 14.2 volts to the battery ,, around 13.6 to 14.5 is fine any more or any less will greatly reduce battery life, this can be caused by defective wiring as well so have that checked
3.) if you have an amplifier that isnt cutting off properly well that can cause this as well by greatly reducing battery life. if you have an amplifier you would need a bigger than slandered battery and in some cases alternator upgrades..
Ok points when buying a battery..
1.) buy a battery that has the longest warranty period you can get,, If its prorated its just like not having any warranty..
2.) Buy Spectype (OEM), or brand name ones like AcDelco, Die Hard, Bosch etc..
3.) Go with a slightly larger battery if you car needs 550cca (which i think it does) go with 850cc or around that, this helps if you have a surface discharge and basically prolongs life..
Looks like your alternator is sending a bad signal to the dash, for instance if your alternator belt came off, all the lights in the dash would light up as a warning,even when the alternator send the right charge.
Typically an alternator is an easy fix. It requires removal of the belt from the engine running it, and a few bolts that attach it to the engine.
Because of the engineering with the 2000 mpv, it is a very difficult fix, and one that requires removal of the transaxle and exhaust manifold, as well as removal of the lower engine mounts. It will take a qualified Mazda mechanic 3.5 hours to do the fix - you can (at least) triple that amount of time as a DIY project (assuming you have the right tools).
Remove negative (-) battery terminal from battery. Remove drive belt from alternator pulley. Remove wiring harness (electrical connections) from alternator. Remove attaching bolts for alternator. Pry out alternator. Reverse steps to reinstall.