This info taken from 1995 Monte Carlo repair manual, should be similar for
Check the stop lamp switch on the brake pedal and the brake transmission
shift interlock solenoid for proper operation.
Gear selector in park.
Ignition switch to 'RUN'.
Disconnect stoplamp switch.
Check for voltage on Brake Transmission Shift Interlock solenoid (maybe
PPL/BLK wire) I'm not sure where this is located on a column shift.
If you get voltage there is a short somewhere.
Reconnect Stop Lamp Switch.
Depress brake pedal, check for voltage coming out of the switch (PPL wire
If yes, stoplamp switch is bad or out of adjustment.
If no, solenoid is bad or binding.
There is a shift lock solenoid on your truck activated by the brake switch..
the most common failure is the actual shift lock solenoid..Its kinda weird
on this rig.. theres a rod coming from the column at the shifter and going
toward the front of the truck.This rod has to move a little to allow the
shifter to move.. it goes through the solenoid I'm talking about .The pin in
the solenoid gets gummy and wont pull in and away from the rod... usually
you end up changing the solenoid.. Bobo
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