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Re: TWO backup lights switches??
The dark green/light green wires are for the reverse lights (backing lamp switch). The switch could be on the top of the steering column under the dash.
The two purple wires are for an automatic's Neutral safety switch (not present in trucks originally containing a manual trans).
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 1970 C10 LWB 350SBC, SM330 Muncie (not saginaw SM326) (on tree), 3.07 open (assumed), PS, PB, Idiot lights
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