Chosen Solution
I’m getting 14.8 volts to the battery with the engine running and heat on.
I figured out what the problem was! The voltage regulator in the battery blew the 10amp fuse in the junction box. That’s why the alternator was running giving the battery 15Volts constantly. After I replaced that and the alternator. Voltage fluctuated between 13.8-14.2 and the Problem was solved! Thanks guys and I appreciate everyone’s help!
The 10 amp fuse was probably for the radio? The voltage regulator is part of the alternator. Voltage regulation is not done by a 10 amp fuse in the battery, batteries don’t have fuses. Why did you measure the voltage anyway, was something else wrong that you went looking for trouble? The alternator has a built in electical noise suppressor and replacing the alternator would get you a new one if radio noise and reception were the issue.
