I have a 1990 F-150. Once the truck has been driven for a while, my "REAR ANTILOCK" light will flash on on the control panel this in turn causes the radio to go off. The 'REAR ANTILOCK' light will go off and the radio will come back on.
In addition to the radio, the cruise control and power windows will not work.

The 'ANTI' light would only flash randomly to begin with, but lately it has been staying on for minutes at a time.

This problem has been going for about 2 weeks. I replaced the altenator 1 week ago.

Any suggestions would be appreciated.
Thank you.

 

just a guess but clean the battery terminals and check the ground connections from battery and from engine to frame