I am trying to restore a 76 21 footer but have run into a night mare in that the main wire to the upper half has been cut. I am hoping someone has a diagram so I can avoid a lot of trial and error. I have wired other trailers but this one is proving to be a true challenge.

Any help will be appreciated - Jon

See if anything on the library page will help you out. Not too much has changed over the years. Hope this helps.
Electrical - Hi-Lo camper travel trailer forum

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"Ruben"
2404T, 2003 2500HD 4X4 GMC Sierra SLT Crew Cab w/Astro camper shell and 2003 Chevy Tahoe LE 4X2
Far West Texas