1979 corvette unknown wire plugs

by James
(Florida)

I can not find these three wire plugs on schematics let alone what and where they plug into under the dash:

1st plug is upper left driver side. Purple and yellow.
2nd plug is down by brake pedal coming in a bundle from fire wall. White,red and brown
3rd plug is upper right side of steering column mount. 2 light green and a blue

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