ignition issues

[ABG RACING]

1972 Mustang coupe 302 C-4. Turn key to start. starter runs engine WILL start, but starter keeps running. Turn key off and everything keeps running. Disconnect the ign. lead to the solenoid and the engine dies, need to disconnect battery to stop the starter. I can turn the key on and jump the solenoid car runs, but then still wont turn off. It WAS intermittent until I replaced the solenoid AND the ignition switch(the electric switch down on the column) NOW it does it pretty much all the time. The starter is very new as well and works correctly when powered or disconnected. SO NEW IGN. SWITCH AND NEW SOLENOID, BUT WIRE TO SOLENOID RETAINS POWER WHEN KEY IS TURNED OFF. is there any particular connection that causes this specific problem on this specific car???

 

[jbojo]

Sounds like the starter solenoid is bad, even new ones can be bad from the get go. I would get another and try it, you can always return it if it's not the problem. If you turn the ignition key to run the starter does not start, correct?

 

[Don C]

I would start at the solenoid, and double check the wiring, make sure the battery and starter are connected to the correct posts, and make sure the starter lead from the ignition switch goes to the "S" terminal on the solenoid and the "I" terminal goes to the coil. The battery connects to the post next to the "S" terminal. Also make sure the mounting bracket on the solenoid is well grounded.

And, John is correct, new doesn't mean good.

 

[rocket366]

Just went through this;

http://www.7173mustangs.com/thread-engine-won-t-stop-starting

So there is a copper plated disc that connects the two sides of the solenoid

and gives the starter AND the coil current when activated.

What happens is the disc "welds itself stuck there" and the starter

continues to crank and the solenoid is supplying power to coil even with the key off.

Say no to cheap solenoids!

Paul

 

[ABG RACING]

Sounds like the starter solenoid is bad, even new ones can be bad from the get go. I would get another and try it, you can always return it if it's not the problem. If you turn the ignition key to run the starter does not start, correct?

Well, not correct. It WILL start the engine. First it was letting the starter run AFTER the engine is running. That was a new relay, then the NEXT new relay would start and run and starter shut off like it should, but engine would NOT turn off with the key. Checking and testing it resulted in BOTH systems getting stuck. Right now the start mode is shut off, but run mode is feeding power from the battery back thru the relay to the ignition wire and it won't click off no matter how hard I hit it. When I picked the car UP it had a busted relay already and it stuck the first time We tried to start it. I suspect the ignition was bad then, but everything is new now. My next move is to go to the expensive store and see if I can get a better relay. THANK YOU for the comments!!!

 

[ABG RACING]

Just went through this;

http://www.7173mustangs.com/thread-engine-won-t-stop-starting

So there is a copper plated disc that connects the two sides of the solenoid

and gives the starter AND the coil current when activated.

What happens is the disc "welds itself stuck there" and the starter

continues to crank and the solenoid is supplying power to coil even with the key off.

Say no to cheap solenoids!

Paul

That's My next move....I always had such good luck with Standard and Niehoff that I haven't bought one in 20 years. I am finding that today's parts aren't what they used to be. THANKS for the input!!

 

[ABG RACING]

I would start at the solenoid, and double check the wiring, make sure the battery and starter are connected to the correct posts, and make sure the starter lead from the ignition switch goes to the "S" terminal on the solenoid and the "I" terminal goes to the coil. The battery connects to the post next to the "S" terminal. Also make sure the mounting bracket on the solenoid is well grounded.

And, John is correct, new doesn't mean good.

All of this has been done, for unkown reasons the new relays are still getting stuck. At this point I am on the same page of multiple crappy relays because THAT IS what is still getting stuck. I was thinking something else must be causing it, but I will see My buddy at parts plus and see if I can get a better relay. THANKS for the input!!!

 

[c9zx]

Have you tried adjusting the ignition switch per the Ford manual?

A maladjusted or faulty switch can cause the problem. Chuck