The switch, which was used on all fullsized Pontiac convertibles of the era, would turn on the courtesy lights which included the two rear armrest lights and the dash mounted front courtesy light.
You could turn on the courtesy lights 4 ways; opening either door, turning the headlight knob all the way counter clockwise past the detent, using the switch on the dash light over the ashtray and the switch in question on the upright part of the left rear armrest. In all 4 cases you are using a ground switch as the courtesy lights have voltage all the time.
I never liked that rear switch because the kids would play with it and you'd end up with a dead battery.
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My Break Away Squad
1969 Fbird (Base, 350 & Sprint Cvt’s - 400HO & TA Hardtops)
1969 LeMans (2dr & 4dr Hardtop and a Cvt)
1969 LeMans Safari 2 seat Wagon
1969 GTO (2 Cvt, 2 Hardtops & Judge Hardtop)
1969 Catalina (3 Cvt’s & a 2dr hardtop)
1969 Ventura 2 Seat Wagon
1969 Executive 4dr Sedan
1969 Bonnie Cvt
1969 Bonnie 3 Seat Wagon (2 of them)
1969 Bonnie Brougham (4dr Hardtop & Cvt)
1969 Grand Prix SJ (2 of them)
1969 2+2 2dr Hardtop (Canadian model)
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