To recap, thought it was weak battery turned out to be a loose wire to the starter (main red) fixed that now 24 volts running to every thing (based solely on bulbs blowing and brightness, fan speed, horn wont stop) so Ithought alternater or voltage regulater. Took to be tested which led to both being rebuilt. Problem still continues. Starter relays? I cant think of anything else.
You cannot troubleshoot electrical problems without an electrical meter.
Go to wally world and buy a volt/ohm meter and use it to verify that you have 24V where you think you have it (rather than assuming that based solely on bulbs blowing and brightness, fan speed, horn wont stop).
If you have 24V where you should not that is a serious issue that needs to be fixed, it may be too late for many 12V components if they have been subjected to 24V for any length of time.
There is a diamond shaped block on the firewall by the glow plug relay (drivers side). What voltage does your newly purchased meter indicate for voltage at this point?
Do you know if your batteries and junction blocks are all wired correctly?
If not download the TMs and look at the wiring diagrams to see how they should be wired into the rest of the truck.
The manuals can be found here:
CUCV Manuals Courtesy of Jatonka