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THE NEUTRAL SAFETY SWITCH IS ON THE TRANSMISSION,
REMOVE SHIFTER CABLE, REMOVE THE NUT THAT HOLDS THE LEVER IN PLACE, REMOVE THE ELECTRICAL PLUG REMOVE THE HOLDING BOLTS AND FINALLY REMOVE THE SAFETY SWITCH, INSTALL NEW ONE IN REVERSE PROSIGER.
The neutral safety switch is located on the top and toward the base of the steering column almost to the floorboard.
To remove or install the neutral safety switch be sure to place the shifter in the neutral position, then dis-connect the wire connector at the neutral safety switch, then remove the securing screws and then remove the neutral safety switch.
Install the new neutral safety switch and do not over-tighten the securing screws, then remove the alignment pin and re-connect the wire connector to the neutral safety switch. (be sure not to remove the alignment pin until the neutral safety switch has been installed)
Check to be certain that the vehicle only starts in "Park" or "Neutral". Here is an image to help assist you, and let me know if you require any further assistance.
Use like reference guide for GM Cadillac 1967-1989 Repair Guide
Neutral Safety Switch - REMOVAL & INSTALLATION
1985-89 Eldorado and Seville See Figure 1 The neutral
safety switch prevents the engine from being started in any transmission
position except Neutral or Park. The switch is located on the upper
side of the steering column under the instrument panel on column shift
cars, and inside the shift console on floor shift models.
Remove the console for access on floor shift models.
Disconnect the electrical connectors.
Remove the neutral switch.
Place 1967-70 column shift lever models in Drive, and 1971 and
later models in neutral. Locate the lever tang against the transmission
selector plate on column shift models.
Align the slot in the contact support with the hole in
the switch. Insert a
in. (2.38mm) diameter pin in place. The switch is now
aligned in Drive position.
1973 and later neutral safety switches have a shear-pin installed to
aid in proper switch alignment so that insertion of a pin is
unnecessary. Moving the shift lever from Neutral shears the pin.
Place the contact support drive slot over the drive tang. Install
the switch mounting screws.
Remove the aligning pin. Connect the electrical wiring, and
replace the console.
Set the parking brake and hold your foot on the service brake
pedal. Check to see that the engine will start only in Park or Neutral.
Fig. 1: Installation of a common neutral safety switch
See Figure 2 1974 and later cars do not have a neutral safety switch. Instead,
these cars have an interlock between the lock and the transmission
selector, which is non-adjustable.
Place the shift lever in Neutral.
Move the switch until you can insert a gauge pin,
in. (2.38mm) diameter, into the hole in the switch and
through to the alignment hole.
Loosen the switch securing screws. Remove the console first, if
Tighten the screws and remove the pin.
Step on the brake pedal and check to see that the engine will only
start in Neutral or Park.
Fig. 2: Adjustment of a common neutral safety switch
1985-89 Eldorado and Seville See Figure 3
neutral safety/back-up light switches come with a small plastic alignment pin installed. Leave this pin in place.
Place the shifter assembly in the Neutral position.
Remove the shifter lever-to-switch nut and the lever.
Disconnect the electrical connector from the neutral
safety/back-up light switch.
Remove the neutral safety/back-up light switch-to-transaxle bolts
and the switch from the vehicle.
Position the shifter shaft in the Neutral position.
If using an old switch or the plastic pin (new switch) is broken,
(2.38mm) diameter pin gauge (drill bit) into the neutral safety/back-up
light switch; the switch is then locked into its Neutral position.
Align the flats of the shifter shaft and the neutral
safety/back-up light, then, align the switch-to-tang on the transaxle.
Torque the switch-to-transaxle bolts to 22 ft. lbs. (30 Nm). Remove the
To complete installation, reverse the removal procedures. Make
sure that the engine starts only in the Park and Neutral positions.
Fig. 3: Neutral start and back-up lamp switch - 1985-89
Eldorado and Seville
Hope help with this (remember rated and comment this). Good luck.
If there is no power at socket, check for a blown fuse, if fuse is good still check it for power, you can check the b/u switch on the trani, I think your is part of the neutral safety switch,do a wiggle check( might be able to see a loose connection) do it with key on wheels chocked and/or E-brake applied,and the trani in reverse. the truck does not have to be running. Just the key in the run position. and you can check for continuity(good ground) at socket. Good luck.