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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
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Neutral Safety Switch?!

  • Thread starter Thread starter MarcMonteverde
  • Start date Start date May 28, 2007

MarcMonteverde

New Member
Sep 4, 2006
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May 28, 2007
#1
  • May 28, 2007
  • #1
i just did a clutch job and when i finished my car wouldnt start? whoever had the car before rigged it up somehow?! doesnt anyone know what wires i can by-pass?!

there are some wires coming out ,

yellow/ liteblue, red/lite blue black / white lines

its an 1987 mustang gt 5-speed
 

HISSIN50

"How long does it take to get help in here?
15 Year Member
Nov 29, 1999
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May 29, 2007
#2
  • May 29, 2007
  • #2
Where are the wires 'coming out'? Near the trans or under the dash?

Check your clutch safety switch if the engine will not even turn over. It's located on the back of the clutch pedal.

Good luck.
 

jrichker

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May 29, 2007
#3
  • May 29, 2007
  • #3
The diagram you want is in here...

No Crank checklist for 5.0 Mustangs

Since some of the tests will bypass the safety interlocks, make sure that the car is in neutral and the parking brake is set. Becoming a pancake isn’t part of the repair process…

Check battery, terminal connections, ground, starter relay switch (also known as solenoid) and starter in that order. The clamp on with 2 bolts battery terminal ends are a know problem causer.

A voltmeter is handy if you are familiar with how to use it to find bad connections. Measure the voltage drop across a connection: more than .5 volts across a connection indicates a problem.
See http://www.fluke.com/application_notes/automotive/circuit.asp?AGID=1&SID=103 for help for help troubleshooting voltage drops across grounds.


1.) Will the car start if it is jumped? Then clean battery terminals and check battery.

2.) Check the battery to engine block ground, and the ground behind the engine to the firewall.

3.) Jump the big terminals on the starter relay next to the battery with a screwdriver - watch out for the sparks! If the engine cranks, the starter and power wiring is good. The starter relay is also known as a starter solenoid.

4.) Then pull the small push on connector (red wire) off the starter relay (Looks like it is stuck on a screw). Then jump between the screw and the terminal that is connected to the battery. If it starts, the relay is good and your problem is in the rest of the circuit.

5.) Remember to check the ignition switch, neutral safety switch on auto trans and the clutch safety switch on manual trans cars. If they are good, then you have wiring problems.
Typical start circuit...
Diagram courtesy of Tmoss &Stang&2birds


See http://www.autozone.com/images/cds/gif/large/0900823d80195963.gif for 88-90 year cars .OR see http://www.autozone.com/images/cds/gif/large/0900823d80195964.gif for 91-93 year cars. See http://www.autozone.com/servlet/UiB..._us/0900823d/80/1d/db/3c/0900823d801ddb3c.jsp for 94-95 model cars.

6.) The starter may be hung, loosen up the bolts that hold it on, and give it a good whack with a big hammer. Tighten up the bolts and try again.

7.) If that doesn't work, use a jumper cable from the positive lead on the battery direct to the starter post where the big wire from the relay connects. If it cranks then, it is the power wire from the relay gone bad. This will be hard to do, since there isn't much room to do it.

8.) Pull the starter and take it to Autozone or Pep Boys and have them test it. Starter fails test, then replace it. If you got this far, the starter is probably bad.
 
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