Owners manual for 1987 pilgrim truck camper model number 636 sb

I did a quick search no luck, the proble is people never had the forsite to keep all the lititure that came with the campers after the warenty was gone. I was licky when I bought my 91 slumberqueen every brochure and manual was still in it, but thats rare.  on that note there is nothing about the elextrical system and how it works in the manual, usaly it would just show the modle number of the converter and things like that.