Haynes manuals typically have wiring diagrams in them. I'm not positive they're the same between S10 and C/K trucks, but they should be. I have an '88-'98 C/K manual with powertrain diagrams for both TBI v6/v8 and CFI v6/v8.
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'92 Sierra - EBL/TBI-fed Vortec 383/700R4/3.08
'87 Fiero GT - 2.8/5-speed'78 Malibu - Vortec 350/4-speed (for now)