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It is likely your charge wire or field circuit is shorted. If you mean you want to install an external regulator, I cannot recommend that, as it will likely cause a fault to disconnect the alternator from the computer. Trace all of the alternator wires, big and small; and I believe you will find a short. If you have an ohmmeter, use it to make sure the field power wire is isolated from chassis ground.
look on youtube for auto repair videos. there will be some on mazdas, and they are all pretty much alike. you can also buy repair manuals very cheap on ebay, they have pictures and instructions.
The alternator has a connection directly to the battery and so does the starter.you have to look at the schematic and one circuit at a time remove all the "hot at all times sources to eliminate what is drawing current.my first guess would be a shorted diode inside the the alternator.disconnect the big terminal on the alternator and see if the draw goes away.A bad ignition could be a possibility,as well as a bad brake switch,or a fuel pump that is running continuous.That is a serious amount of current.best of luck with it.
YOU NEED TO REMOVE SUBFRAME TRANSVERSE SECTION.YOU HAVE TO REMOVE EXHAUST FRONT PIPE.THEN REMOVE RIGHT AXLE SHAFT AND CENTER SHAFT ASSEMBLY.THEN YOU CAN REMOVE ALTERNATOR.
you probably got a defective alternator...this happens more than it should...perform alternator output test at 2000 rpm you should make 13.6 volts and up to 100 amps of power under load.
Check the large fusible link labeled ALT in the under hood fuse box. If this fuse gets blown, the alternator wont be able to charge even if it IS new,because the ALT circuit is open.
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.
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