Diagram wiring neutral switch - 1999 GMC Sierra

Not called park neutral safety switch any more . Called internal mode switch . It is a input to the ECM - engine control module . Does not go directly to the S terminal on the starter solenoid . Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. Year , make , model . Under system click on transmission / transaxle ,then under subsystem click on transmission controls . Click the search button then the blue link.
You have a no crank problem ?

Free wiring diagrams at http://bbbind.com/free_tsb.html .

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Don't believe it's there. You have a buick? You must have an automatic? lThe park/neutral safety switch is usually in or on the transmission, and the wiring for it is usually ran through the electrical connector for the transmission. You would probably need a shop to test it, as they would know where and which wires to check. Likely two wires which would have continuity in park or neutral, and no continuity in other gears.
If you want to test it you would need a wiring diagram for your car-good luck.

Park neutral safety switch , try moving gear selector to neutral . If that doesn't let it start ,viewing wiring diagrams an testing the starter electrical circuit's with a DVOM - digital volt ohm meter .
How to voltage drop test starter motor circuit
Electric Testing Techniques You Need to Know

Learning the correct way to test will avoid hitting those walls .
Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine . Under system click on engine ,then under subsystem click on charging . two diagrams , one is the starter electrical circuit . Click search button then the second blue link. Is the security light lit on the instrument cluster ? This will keep it from starting .

by-pass the switch with jumper wire.If it starts,badd switch if not its somthing else

Some starter solenoids are mounted on the fender near the battery and some are on the starter itself.

Typically the ones mounted on the fender have two larger posts and one smaller post. For the larger posts: One connects strait to the positive post on the battery. The other connects strait to the starter. The smaller post connects to the neutral safety switch which connects to the start position of the ignition switch. Here is a diagram. Make sure the solenoid is grounded good.

For the solenoid that is mounted on the starter: Connect the positive post of the battery to the large post on the starter. Connect smaller neutral safety switch/ignition switch wire to the smaller post.


Here is a diagram if you have both solenoids

Don't forget to hook backup any other wires that were hooked to the positive side of battery/solenoid like alternator wire etc.

Neutral safety switch diagram

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