Question about 1990 Ford Mustang
Hello, There are small wires that attach to the Starter Relay. These are the wires Mechanics call "tickler" wires. There should not be power going through the tickler wire unless the Ignition switch is turned to the START position.
Disconnect the small wire off of the Starter Relay. Leave it off and put your battery cable on the Battery. The Starter should not crank. The Ignition should be OFF.
Now we need to find out where the tickler wire is getting power from. Put a Multimeter or test light on the Tickler wire for POS and ground the other wire on the tester to a NEG ground. I suspect your problem is in the Interlock switch. The Interlock switch would be on the Clutch pedal lever under the dash for a standard shift.
If you had an Automatic transmission, the Interlock would be in the shift linkage or Brake pedal lever. Without changing from an Auto to a Standard trans people have trouble hitting the under dash Interlock switch with their shoes getting in and out of their cars. Even while driving you can hit the under-dash switches with your shoes.
So check under the dash for a broken or dislocated switch on the Clutch or Brake pedal levers. Then move the switches until the Test equipment shows the power is not going to the Tickler
wire . Once you do this you have to make the START position work on the Ignition switch. Leave the tickler hooked up to the test equipment until you get the wiring right. You may have to adjust the Ignition shift-rod in the steering column so that START means the correct thing only in the start position.
I hope my solution is very helpful in giving you ideas about fixing your car.
Posted on Mar 17, 2011
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Posted on Jan 02, 2017
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