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For reverse for an auto trans. on the Transmission Range switch there is a Pink wire which is 12 volts from Backup Fuse F28 15 amp. When the transmission is placed in reverse 12 volts goes thru the switch to a Light Green wire.
Verify 12 volts is what the unit is looking for when the trans. is placed in reverse.
If it is, tap into the Light Green wire.
The Light Green wire powers the two Backup lamps and the two Backup cornering lamps.
ok. hooked on vettes told me the reverse wire. that means all i need is the vss