I have a 67' with new battery,alt.,voltage reg,and horn relay that isn't charging the battery. While tracing the wires the 16ga. brown from the voltage regulator ends up at the harness for the dash cluster which I no longer have and a small brown w/white stripe goes to nothing. With the car running the only live wire at the voltage reg. is the big red one. Thanks for any input.

That brown wire used to go to the gen light, and from there to the ignition switch. It's what turns the alternator "on" With it hanging, I don't think it wil charge.

If I just jump from their to a 12v switched source will I be good to go? Thanks

Ok so my neighbor just stopped by and tested my alt which is good so I'm gonna try running a wire from the ign. to a light then to the brown lead and see if the blue at the alt. gets power.

If I just jump from their to a 12v switched source will I be good to go? Thanks

I wouldn't

Ok so my neighbor just stopped by and tested my alt which is good so I'm gonna try running a wire from the ign. to a light then to the brown lead and see if the blue at the alt. gets power.

That I'd do...

These diagrams might help.

Larry

http://hawkpichost.com/ims/album.php?u_id=47kT1HB

This was written by another member, a very good write up on how it works and how to troubleshoot a externally regulated charging system.

I dug this out from before, hopefully it help. If not, just post or send me your questions.

I'll try to provide a simplified explanation of how the externally regulated alternator and regulator work here. This explanation starts from a parked car with engine off state.

The regulator brown #4 wire is connected through the light bulb to 12V whenever the key is in the ON position. The other end goes through a set of points in the regulator and then out the F terminal to the field winding in the alternator. So some current begins flowing in the field winding from this connection. The little bit of current flowing produces a weak magnet field in the alternator and also lights the bulb.

When you then start the car, the weak magnetic field from above begins rotating which makes the alternator producing a little bit of voltage. This voltage is fed from the alternator to the regulator on the white regulator #2 wire. This wire connects to a coil in the regulator and turns on a contact when the voltage goes above 3.2V.

Once the contact turns on in the regulator the #3 and #4 terminals are connected together. Terminal #3 is battery power so this puts battery power on both sides of the bulb and turns it off. This means the brown #4 wire should go to +12V. Also, this connects the field terminal right to battery power but still going through the points.

When the battery voltage goes above a set level, the F terminal is disconnected from the battery power by the points I kept mentioning. Then the voltage drops and the points close again. This on-off cycling happens rapidly and is how the voltage gets regulated.

From the above (KOEO = key on engine off and KOER = key on engine running).
F or #1 terminal (field) - KOEO = #4 slight voltage, KOER = 9-12V typically
#2 terminal (sense) - KOEO = 0V, KOER = >3.2V
#3 terminal (Battery) - KOEO = 12V, KOER = 12V
#4 terminal (light) - KOEO = F slight voltage, KOER = 12V

By 12V above I mean battery voltage, which may be 12V when engine is off but could be up to 14.5V when engine is running.

Check the light: Ground the brown #4 terminal wire at the regulator. When grounded the light should come on. If you don't have a light then skip this test. Test this with the connector off the regulator.

Checking the alternator: Jumper the blue wire F terminal to the battery post on the back. This should make it easily crank out 16+ volts. Next, connect a troublelight between the battery post and the F terminal. The light should come on and you should measure > 3.2V at the other alternator terminal. If it passes these tests, then it's in the regulator or wiring.

Checking the wiring: At the regulator connector jumper the brown light wire (#4) to the F terminal (#1) and you should be able to measure >3.2 volts on the other alternator terminal or terminal #2 of the regulator connector. If these tests pass, it is in your regulator.

When doing these tests, make sure you turn off or pull the fuses for any added electronics that you can. The alternator test can produce enough voltage to damage stuff.

Peter

the way I have it as of now the 16ga. brown goes to a light then to 12v hot in run. The light comes on and is hot on the 12v side. Then their is the 24ga.brown w/white that I'm not sure whether to ground or power. Thanks

Hey I got it working. When reading the last post it says that terminals 3 and 4 are together and I had the extra tab on terminal 4 going to ground so I unhooked it and she works. Thanks guys