Question about 1988 Oldsmobile Ninety Eight

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I have a 1988 olds 98 regency brougham and my backup lights not working I need help with checking the safety neutral switch which wires to check for power and counity

Posted by Ethan Doby on

  • Ethan Doby Nov 15, 2016

    Gm called it a twilight sentinel switch the colors are brown black white and green I took a picture I don't know how to upload it

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jack layton

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  • Oldsmobile Master
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This is an old diagram I found, hope the wire colors are correct?The dark blue wire carries voltage to position switch for back up lamps. When in reverse the lite green wire carries voltage to back up lamps and the black wire is ground.
I have a 1988 olds 98 regency brougham and my back - 26350649-grmmnbevmth1gpeu1cszi4fd-4-0.jpg

Posted on Nov 11, 2016

  • 16 more comments 
  • Ethan Doby Nov 12, 2016

    Thank you which wire am I checking for power and which wire do I check for continuity

  • jack layton
    jack layton Nov 12, 2016

    Check the dark blue wire first, key on.

  • Ethan Doby Nov 13, 2016

    The dark blue wire has 12 volts I check it with my test light with the key in the on postion now what do I do next

  • jack layton
    jack layton Nov 13, 2016

    Check the lite green wire for voltage with tranny in reverse. Have a helper sitting in the vehicle with foot on the brake and parking brake set. Remember, safety is your responsibility.

  • Ethan Doby Nov 13, 2016

    that wire don't have power is the car in the on postion if so it has no power

  • jack layton
    jack layton Nov 13, 2016

    Start the vehicle, put tranny in reverse. Remember to use safety precautions I mentioned. If that wire isn't hot, I think the position sensor is faulty.

  • jack layton
    jack layton Nov 13, 2016

    You could even use jumper wire to by pass position switch, on the proper color wires, If the back-up lamps work, the problem is the position switch.

  • Ethan Doby Nov 13, 2016

    Yeah I think your right that wire has no power another thing the black tube that the the wires comes out of there's a vacuum line and when you look up a new switch I don't see it

  • jack layton
    jack layton Nov 13, 2016

    The vac line may go to tranny not position switch? My info on your vehicle year, isn't very good.

  • Ethan Doby Nov 13, 2016

    Oh so do the vacuum line comes out of the black tube

  • jack layton
    jack layton Nov 13, 2016

    w/o being able to look at it, I have no idea. Sorry

  • Ethan Doby Nov 13, 2016

    that's kool I'm look at it real good before I remove the switch. I Have another thing my instrument cluster lights don't come on and the ashtray light

  • Ethan Doby Nov 13, 2016

    I'm really grateful for you helping me

  • Ethan Doby Nov 14, 2016

    That's the thing park lights work but cluster lights don't come on and the ashtray light don't come on

  • jack layton
    jack layton Nov 14, 2016

    I'd have to track wiring off headlamp switch or wiring at instrument cluster. I don't have wire colors or wiring diagrams for that. Sorry

  • Ethan Doby Nov 15, 2016

    This is the dimmer switch let me know if you need more pictures

  • Ethan Doby Nov 21, 2016

    Jack r u still helping me

  • Ethan Doby Nov 23, 2016

    can anybody help me please

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Ford Neutral Safety Switch; Ford Reverse Light Switch; Backup Light Switch.

The Neutral Safety Switch wires in my 1971 Ford F100 are orange with a blue stripe.
The Reverse, or Backup Light Switch wires are black with a red stripe.

There are two sets of two wires across this combined neutral safety and backup light switch, for a total of 4 wires. Photos are at the end of this post.

The switch for the 1971 Ford F100 pickup truck is the same as in many other years and models. For details, including parts numbers, see the following quote from an expert at Ford Truck Enthusiasts:
http://www.ford-trucks.com/forums/287185-back-up-light-and-neutral-safety-switch-2.html#post5601846

The neutral switch also controls the backup lights, and is the same 1967/77.

C7TZ-7A247-A .. Neutral/Backup Switch (Motorcraft SW-600)

There is no separate backup light switch..except on 1967/68 F350's.

Neutral switch location 1967/77:

The plastic half moon shaped neutral safety switch mounts on the outside lower portion of the steering column (NOT on the transmission!).

It's activated by an inverted Y shaped lever that snaps on the shift tube

D0TZ-7B097-B .. Lever, Neutral Switch Actuator = From FTE sponsor DIRECT FORD PARTS: Ford suggested retail price: $18.72 / FTE member net: $13.23.

The switch is also still available from Ford, but the website is down so I can't post the list & net prices. .

1978 is the FIRST year the F100/350's have the neutral switch mounted on the transmission. __________________

Bill // Retired Ford Parts Manager // SoCal Chapter member // Part Number Research: 1928/2001 FoMoCo vehicles.

IMAGES
jim_pivonka.jpg
Driver side of the neutral / reverse switch showing the travel slot for the switch arm, the return tensioning spring, and the arm.

jim_pivonka_0.jpg
The front, steering wheel side of the neutral / reverse switch after removal from the steering column. The switch's two functions are actuated when the lever in the column moves the switch lever shown here to different positions as gears are selected.

jim_pivonka_1.jpg
The neutral switch is installed on the steering column near the firewall, with 5/8" bolts into the steering column (visible hole) and down column from a rectangular opening in the column housing. The actuating lever for the switch is attached to the gear shift shaft inside the housing; the lever is visibly protruding from the opening in this image.

jim_pivonka_2.jpg
Back of neutral / reverse switch, showing the wiring attachments. Black with red stripe is the backup light wiring, Orange with blue stripe is the neutral safety switch, it prevents starting in gears other than neutral & park.

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0b4222e.jpg

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