The best source I know of for a wiring diagram is the '70 Pontiac Firebird service manual supplement (the main 70 Pontiac manual did not have the Firebird included as it was a mid-year introduction). Unfortunately the wiring diagram is not in color, but does have the colors written in type for each wire, for example "blk" for black, "blu" for blue, etc. I believe the Firebird supplement manual has been reprinted and is available from various restoration parts suppliers.
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