Where is the backup light switch on a 1989 Chevrolet silverado 1500 pickup truck?
The backup light switch on a 1989 Chevrolet Silverado 1500 is on the transmission. It's a mechanical switch that's activated by the transmission shift linkage. You won't find a separate switch on the dash or elsewhere. To access it, you'll likely need to remove some parts of the transmission linkage or possibly even the transmission itself (depending on the specific location and access).