Frustrating electrical problem

[87TtopMan]

This day has been crazy. I replaced my control module then had oil pressure problems but was able to fix it as stated in another post.

Now after driving alittle my car amost stopped cause voltage dropped badly. Didn't have anything on for more amps to be used. Then it started getting alittle better but still not good. I was on the way to replace my alternator. I replaced it with the 100 amp Pa-performance alternator then cranked the car up but still my voltage reading in the car is not good. Even get the amp warning by the speedometer. So i played with the wires near solenoid. Made it worse. Checked them out and found one that broke, fixed it and checked with meter for resistance and it was 0 so I thought I had got it. But still I am having issues. I turn on everything and Voltage is almost at 9 volts. Checked battery voltage and it was 14 so thats good. Does anyone know what else to do. Can I buy new wiring from harness to solenoid. Cause they are connected under the solenoid to the wiring harness but dont know what to ask for at the parts store. The reason for wanting to replace those is cause they are fragile and corroded bad. Thanks