Help with Furgon Susuki Manual Year 1980

Dear Sirs,

My name is Luis from Chile, and I registered on this page because I found it very interesting, and also because I need your expert help.
I am looking for the technical manual and/or electrical diagram for a 1980 Suzuki van (commonly known in our country as a "pan de molde," or loaf of bread).
This vehicle belongs to my uncle, and it is currently out of service with a fantastic wiring harness. There are some things I haven't been able to get working properly, such as the
high and low beam headlights, turn signals, brake lights, etc.
If any of you could help me with any information, I would be eternally grateful.
Thank you in advance for your help.
Regards