Sounds like it's running on the battery and not charging. Did you polarize the generator when the regulator was replaced? If not, try polarizing it. With the engine off, run a jumper wire from the NON GROUNDED battery terminal and spark it to the "A" post of the generator. Just touch it long enough to see a spark, don't leave it connected. Then try it to see if it charges. If you have a volt meter, with the engine revved up, a 6v system will run around 7v, a 12 v will run around 14v. If you don't have a volt meter, try disconnecting a battery post, see if it keeps running.
To test the generator, after polarizing it, disconnect the "F" terminal wire. With the engine running, ground the F post of the generator. The generator should begin to charge.
The growling noise, you can remove the belt, feel for slack, looseness, roughness in the water pump and generator. Start the engine with the belt off, listen for the noise to go away. Also, you can use the "screw driver stethoscope", take a long screw driver, put the handle to your ear, carefully touch the blade to the generator, water pump, timing cover, where ever you suspect the noise is coming from, and give it a listen.
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