I recently purchased a 1986 d30 CUCV with 58k miles on it. I'm now having a nightmare of a electrical issue but I don't know much about it, to start my battery will not hold a charge or is not getting a charge, so I bought two batteries only hooked up one of them for now because I'm still not able to get the battery to get a charge. I had both alternators tested by a shop the specializes refurbishing batteries and alternators and they said they were both working. When I bought the batteries after about one day of being able to drive around and start the truck no problems the truck died and wouldn't start for me.The person who owned it before me also switched it from a 24v to a 12v system. So now I have two batteries that should be good and two alternators that should be charging them but i continue to have to jump myself off of the second battery in order to get from A to B. I should mention that I also think that there is power getting into the solenoid on the firewall but not getting out the other terminal, not sure if this could have to do with my problem. Any help will be greatly appreciated.