charging problems

[sodbreaker]

Ok to start out I am bad with wiring. I have a 1968 f250 high boy I put a 1970 f250 camper special sport custom body on. After first swaping bodys the charging system worked as it should and always showed a charge around 14volts on my volt gauge. Did not drive the truck much at that time though due to drive line issues. I've since replaced most of the drive line with newer 1979 f250 4x4 drive line with a 300 l6 with a 1968 points distributer in it 235 four speed with married tcase and high pinon front axle. Since getting the new drive line in I have drove the truck about 2, 000 miles with no charging problems at all. The last several hundred miles some times it will charge and some times not as in going down the road can watch the volt gauge show a good charge for awhile then all of a sudden show discharge with no pattern or anything between boughts of charging. With engine swap put in all new 2gauge battery cables with clean connections have replaced alternator once with autozone replacement. That's what was on the original truck when I started they tested it said was bad gave me a new one. Same deal take this one back they say it still tests good. My main question here I guess is with this being a camper special do they have different wiring than a regular truck? I have two other 1968 trucks both 2wd non camper special and they have totally different wiring set ups for the starter seleniod alternator and regulator. As in this truck has a extra relay box or regulater idk. I was thinking of cutting all the extra wiring out and putting a plain harness in its place from the selenoid forward from a parts truck I have with just one mechanical regulator but have extra wires left over and different colors of wire if I would do that so not sure if that the right thing to do or not. Curious if any one has any ideas or suggestions on what I should do to get a good steady charge. Thanks for reading and any help I may get. I know kind of a long post with spelling problems

[bluef250]

From factory, harnesses should be similar. CS had additional circuits for camper and lights.

Check the ground wires from engine to body and everywhere else.

[sodbreaker]

Well I tore into the harness further and this harness is similar to the harnesses in regular 68's I have with the exception of a extra red wire in the charging harness and a different shape/style of regulater. At least what I'm guessing to be the regulator. There are the number of wires of same colors going to it as my non camper special trucks. Then there is another box bellow that that is wirred in with the regulator with the extra red wire going to it. I'm curious what the extra box and red wire are for and if I can take them out n still have a functionable system. I will check over the grounds again but I'm pretty positive there all ok. When put new engine in all were cleaned and greased or replaced and greased. I've tryed posting pics of the extra box and plugs but won't let me upload them