98 FORD EXPLORER EATING ALTERNATORS AS SOON AS I PUT THEM ON WHY

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green/red is the charge lamp circuit. when grounded it should turn the light on,if it doesnt, you may have a blown fuse. the lamp circuit provides the "turn on" signal to the alternator as a positive voltage. the voltage regulator is a gounded load until the alt starts charging, than it puts out a positive voltage to turn out the light.

Someone is missing something. Suggest alternator may be putting out voltage but not amperage or vice versa.

Battery light on ! alternator isn't charging . Test the alternator electrical circuits .Main cable on the back of the alt. should have B+ voltage .Pin # 3 at the connector on the alt. should have B + voltage - fuse F10 10amp under hood fuse box supply's B+ to pin #3 . Pin's 1 & 2 at the connector go to the PCM - engine computer . This is a computer controlled charging system .
Ford PCM controlled alternator testing

I had a similar problem on my 98 Tioga (Ford v10). Turnd out to be just a blown fuse in the cab (wich controls the alternator's regulator.) First, confirm its the charging system and not the battery it's self. To do this, start the engine and take a voltage reading at the battery. It should be above 13 volts. If you don't have a tester, with the engine running, disconnect a battery terminal. If the engine stalls, it's proff the alternator is not out putting as it should. Check for a blown or missing fuse. Anything labeled "intrusment cluster" or "Alt" (maybe 14). If the fuses are ok you'll likely need to replace the alternator it's self. On those engines it's not hard to do. Only takes about 20 min and the the alternators are around $130. But defiantly check the fuses first.

You need to check the out put of the alternator. In general the alternator should put out 13.5 to 14.5 volts. I would say go to where you bought the alternator and have them check the voltage. If check engine light is on you should have a code get them to check the code. Most auto part stores where I live will check your code for free.

put a socket at torque bar on the bolt ant turn counter clockwise.

Sounds like you may need an alternator.
If the batt is ok, could be the alt going out.
A local pep boys or equivalent can check free or inexpensively...
The voltage regulator is built in to the alternator... so if you change the alternator, you change the regulator too.
k

replace the link between the alternator and the positive side of the battery. This is a fusable link and sometimes can cause this problem this would be the easy fix and is hard to test

well has soon as you loosen and take out the alt the belt will become loose then put alt on it will slide down to put belt around and then pull up on alt and tighten it up