pete97GT

just put on a brand new alt and nothing, same thing, not putting anything out, exactly what do the three wires going into the voltage regulator do????

pete97GT

bump

Joel5.0

Just in case....check the 3G alternator wiring diagram....



Now....make sure you have the correct voltage at the correct time at each wire.

Ros3n

do you have underdrive pullies?? if so that could be it... i know i had the UD's installed and it barely puts out anything with the headlights on at idle and it will sometimes surge..

pete97GT

yeh that was my question more or less, how do youknow what the volt should be at those wire and how to check them, whats the yellow/white wire for ? anyone know, b/c thats not putting anything out, thanks for the diagram tho, helps a lot

Joel5.0

That wire (A) is used by the regulator to check alternator output and...........regulate, know how much power needs to be output......it should have 12vdc all the time (since it goes connected to the output post). LG/R is the IGN ON 12vdc supply.

piedraco

how important is that mega fuse for the system? Why cant I just run the wire from the battery to the alternator? 89 vert 3g upgrade

pete97GT

well from what i heard is you can start a fire if something goes wrong, otherwise you will seriously damage something. instead of a mega fuse tho, i used two fusible links, oh btw i have a multi meter, i just checked all the wires and traced them to a bad fusilink, thanks tho

gjmack3

At the B+ terminal, you should see source voltage. That means battery voltage. This is the main output from the alternator to run you electrical system.
The "I" terminal recieves voltage from the ignition switch through the charge lamp and is used to wake up the voltage regulator. Expected voltage at this wire with the key on and the charge lamp on is 1 to 3 volts at the regulator plug.
The "A" terminal recieves power from the battery. This is the circuit that provides current to the rotor inside the alternator to create the magnet that creates the voltage and amperage that the car uses to operate. Expected voltage value key on: close to source voltage.
The "S" terminal recieves AC voltage from the stator and sends out a voltage signal to turn off the charge lamp when the system is operating normally. If there is no AC voltage, then it allows the charge lamp to come on informing you that there is a fault in the system.
You will cause a big wire fire if you remove the fuse. Does the charge lamp come on when you turn the key to the on position? KOEO: Key On Engine Off. If not, that is a good place to start. It means that the regulator is not seeing any voltage applied to it to wake it up. Remember you should see 1 to 3 volts there KOEO charge indicator on. Hope this helps a little.

AdderMk2

that would be BAD

check your fusable links