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Sean -First, welcome to the site. Where in NE are you from. I grew up in the Panhande. I have family there still and in eastern NE near Fremont and other areas.Here is a link to the 1989 wiring diagrams. The wiring diagrams, as well as the manuals, are available on this site. All the manuals are found in the Tech Pages. Wiring: http://www.73-87chevytrucks.com/techinfo/7387CKMans//Wiring/ST_350_89_1989_GM_RV-P_Light_Trucks.pdfI'll be watching your progress. I like dually crews!Rusty