How i can install external page port of a pabx Norstar with output of 600ohms to the input Radio shack 250 Watts PA.

it is possible that the PA speaker output is intended for a normal (unpowered, unamplified) speaker. Perhaps in your case the audio you hear from the PA speaker is only signal leakage from the PA Speaker connection.
To know.. connect a regular speaker to the PA speaker connector (any speaker, home audio, old car 6x9....). If the PA works and drives the temporary speaker OK, and you hear no CB receive, then the PA output is for a normal speaker, with leakage of CB audio.
It is just a guess, but easy to try.

no,its supposed to work that way so you can monitor it while you are outside your vehicle.

One or more output transistors are damage, change output transistors and emitter resistors

I had this problem to the only stereo rca input I could find was the top red and white. Everything else is mono, I'm currently working with 1.so if you have any advice please let me know.

There's a very real possibility that your output stage transistors got fried.

Fuses are inside next to power supply transformer.

per fcc rules (laws)? you cannot put an amp on a cb. max output 4 amps. you should be able to put a pa speaker using the pa output jack. take your radio back for warranty.

Yes. It won't be great, but if you're starting out you should be ok. Musiciansfriend.com has some of the more popular pa options - generally radioshack=bad.

for the past month i have been shopping for the perfect home theater system and have narrowed it down to a bose system,a sony system and a paramax p510...i have listened to all 3 systems and have found the paramax to be the better system not a cheaper system but seem more bang for my buck at 3200$,a very powerful tube amp and downfiring sub maxes out at 2000 watts...

You extend wire from speaker what ever you want distance.