Question about 1990 Ford Mustang

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Starter stays enegaged on 1990 mustang gt

Checked soleniod on firewall. i have power when key is on on positive side of sol. when key is turned to start, the start terminal is powered and goes out when released. the starter side of sol. is powered and stays hot even if key is pulled out of ingition switch.i usally can tap on solenoid or disconnect it totally until the contacts break in the solenoid internally. i even can disconnect wire leading to starter and the solenoid still hangs up. note already replaced solenoid and ingition switch. also i can turn key on and jump hot lead bat POS and the lead to the starter on the solenoid and it will START WITHOUT engageing starter all the time

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Sounds like solenoid is shorted to ground internally

Posted on Dec 02, 2008

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1 Answer

Starter wont engage


Could be the switch, the solenoid, or the starter. You would need to check for power at the starter post each time the key switch is in the start position. You can hook up a test light or a meter to watch it.

Jul 08, 2013 | Ford Mustang Cars & Trucks

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I was driving on the road when the starter engaged and burn out, I replaced the starter motor, starter relay, and ignition switch. turned the key and starter stays on. had to disconnect battery to stop it....


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.

Mar 17, 2011 | 1990 Ford Mustang

1 Answer

1990 Buick Century Limited wont start, but makes a click sound under hood on drivers side when you turn the key. But no battery noise. Battery measures a 11.50-12.00 . 154xxx miles Thank you


Check for power at the starter on the large wire. There should be battery voltage at all times. Next check for power on the small wire at the starter. There should be twelve volts with the key in the crank position. If both of those check out you need a starter.

Jan 26, 2011 | 1990 Buick Century

1 Answer

What is wiring diagram of 1990 Chevy suburban starter I have three wires two go on the big post coming out of the soleniod one attached to the small post on the soleniod cart wont turn over


check that you have 12 volts at the big post with the two wires.If you have voltage there then very carefully touch the big post to the little post with a steel rod or screwdriver. If your battery is good then this process will bypass the keyswitch. be careful because as soon as you touch the two post the engine will turn over. The little wire send a signal to the solenoid to engage the starter motor. check the voltage of the little wire dissconnected. when someone turns the key to the start position the little wire should get 12 volts.

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your starter,solenoid or ignition is no good. but my first choice,i think your solenoid is shorted because when you hook up the battery,it cranks but does not start.that means your ignition switch is still working.

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if the car is an auto please check the switch on your auto box also starter soleniod part of starter motor try and check power to soleniod when turning key and check your soleniod connections

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try to turn the engine by hand on the front cranshaft pulley with a socket, if turns engine is ok, but if not engine is gone,
and not only check the powers also check for a good ground,
and clen the batterie conectors very wheel even if they look clean electrical systems are very tricky

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