If you buy the '70 Chevy Truck Series 10-20-30- Chassis Service Manual from the part vendor of your choice (about $30), you get the schematics in the back of the book. They will also sell you the wiring diagrams separately for $5 bucks for 3 or 4 pages. That's a ripoff. The full manual you can't keep these trucks running without. Get the Chassis Overhaul Manual too.
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