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Locate the reverse switch; location will depend on your column/shifter.
If you are using a factory GM column, it can be found at the base of the
steering column as seen below.
If you are using an aftermarket
floor mounted shifter, this
switch may be found on the
base of the shifter. There may
also be a Neutral safety switch
found on the shifter as well.
When testing the system, if you
notice the revere lights on
when the transmission is in
park or neutral, you have the
reverse switch wires connected
to the neutral safety switch.
Small insulated terminals have
been provided in the parts kit to
accommodate aftermarket
shifter reverse switches.
Painless offers part #80175 for those
using GM 350, 400, or 700r4
transmissions. This part can be used
as either a reverse switch or a neutral
safety switch.