Alternator light staying on

i have a problem with my Baja. i have just put in a new dash and after playing around with wires and new guages the alternator light is staying on and after a couple of hours driving the battery is dead. checking the voltage i am getting 12.5 volts at one of the alternator terminals red thick wire but at the other terminal which is a green wire it gets maybe 1 volt. is this right or is my alternator stuffed or is there another dodgy wire. when i test the battery it is also reading 12.5ish volts If there is any auto elects or just someone that knows wiring i would love to know your opinion is there any other tests i can do to test the alternator

checking the voltage i am getting 12.5 volts at one of the alternator terminals red thick wire

Is this with the engine stopped?

the other terminal which is a green wire it gets maybe 1 volt.

Is this with the ignition on?

Does the light come on when you first turn ignition on?

checking the voltage i am getting 12.5 volts at one of the alternator terminals red thick wire

Is this with the engine stopped?
Yes when the engine is off but ignition on i get 12.4v

the other terminal which is a green wire it gets maybe 1 volt.

Is this with the ignition on? yes when ignition is on but engine off i get 1.5v

when engine is running i get same volts but if i turn lights on it drops .2v

Does the light come on when you first turn ignition on? yes light comes on

check all your fuses are good aswell.....

had a similar problem last week - fkd around alot untill realised it was a stuffed fuse - i lost like my fuel guage and indicators aswell as the alternator light staying on if this helps

goodluck

nick

The alternator big red wire should read 12-ish with the engine switched off (12.5 is OK) and it should read between 13.5 - 14 when the engine is running. Your alternator is therefore not charging! Replace the bushes and/or regulator. There are no fuses between the alternator and battery so it's not that.