loses the entire load the battery

Greetings, I have a small problem with my Montero Sport of 1998 that sometimes the tacomethar needle goes crazy while I am driving and then goes to zero and the spidomenter goes out (it is digital). For Colgo yesterday while Hiba for my work the battery of the bus lost all the load to such a degree that I did not run anymore and the bus was stranded on the road causing an accident. I change the battery, verify the alternator and apparently it is fine. You could give me some light with this problem. I will thank you.

Hello, for the symptoms you describe, I think the problem is on the alternator's pulley. This one carries a Crickt system (similar to the pinion of a bicycle, to the one side- for the other, no). If the Pulley Cricket system is worn, increasing the load, skate, preventing the battery charge, which is exhausted by the consumption of the injection system + accessories. On the other hand, the tachometer has the revolutions from the alternator, which explains why the needle goes crazy.

Good luck, and greetings from Córdoba, Argentina.