Ok doing PMS on the old girl yeasterday took out the batteries to clean both the terminals and post also to check the batteries for there voltage. So all went well, batteries by themselves 12.30 and 12.31 Started it was going around I think 14.5 each either way they where almost the same , but I am getting off topic so I took it all apart and put it back together again drove it last night no problems so I went to go to my brothers bday party and no cruise the whole way well f--k( side note horn has not worked since I have got it. Check all fuses and relays I think all the cliltons has told me). Now on the way back no problems worked like a charm so I think I might have a electrical problem. So I have basic diagrams could anyone offer so any help that would be outstanding

 

You need to clean ALL your grounds and clean all batteries post. This is where I would start. Bad grounds gives head ache.