not charging

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Wayne Rider

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I have a 1975 Dodge Dart Sport that is not charging. I have a new alternator(powermaster) and new voltage regulator (Echlin) . The motor was completely rebuilt , we have power to alternator with switch on (blue wire) the green wire reads through when you turn switch on . no power but to ground . I had a spare new voltage regulator and tried it , though it is possible to have two bad ones I feel like I am missing something. Please explain to a simple man what I am doing wrong
 
Wayne Rider said:
I have a 1975 Dodge Dart Sport that is not charging. I have a new alternator(powermaster) and new voltage regulator (Echlin) . The motor was completely rebuilt , we have power to alternator with switch on (blue wire) the green wire reads through when you turn switch on . no power but to ground . I had a spare new voltage regulator and tried it , though it is possible to have two bad ones I feel like I am missing something. Please explain to a simple man what I am doing wrong
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Tell us about the alternator. I assume (dangerous) since you're talking about a "blue wire" that this is not a one wire alternator, correct? Also can you expound on what "no power but to ground" means?
 
I am sorry it is not a one wire alternator. I have 12 volts to positive on alternator . I do not read continuity from ground to green wire until I turn switch on . The blue wire has 12 volts at all times switch on or off , we had all the wiring harness out and untaped , cleaned and retaped every wire but none were cut but I may have exposed a bad place or something. We didn't see any places and I don't know for sure how this should work ; what has power and when it should and should not have power . Thanks in advance
 
You have an isolated field alternator.
(Square back)

The blue wire provides battery voltage via the ignition switch to one of the two field terminals. The other field terminal is hooked to the green wire that goes to the VR.

the VR has a switched battery voltage wire and a ground.

When the VR sees less than it's setpoint for voltage, it increases the amount of ground thus increasing the magnetic strength of the field which increases the output of the alternator.

So, what should you see on the wires...

Blue, battery voltage blue terminal to battery negative

Green, far less than battery voltage green terminal to battery plus.
 
The large wire from the alternator goes to the bulk head and from there to the amp gauge, from the amp gauge back to the battery. Check that wire and the gauge
 
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