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cant kill engine with key

cant kill engine with key

chadalan

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Location
sterling, ok
Vehicle(s)
1976 cj5 straight 6 258 cid . 3 speed man Tran for now.
Just got CJ5 few weeks ago, but yesterday I couldn't kill the engine with the key. Po put a ignition lock or key on the dash, ran two wires to the starter solenoid and splice the wire coming from the ignition port into a wire coming off the tachometer and a black w/ white stripe wire( idk were it comes from). I put a new ignition lock like the one that po had but I still can't kill engine HELP
 
It's frustrating fixing what a PO did because the first step is to find out what he did.

Okay, the first thing I would check is the voltage on the small wire on the + side of the coil. With the key turned off it should not have voltage on it. If it does that's were your wiring problem is.
When the key is on it should have 12 volts.
 
If that doesn't do it see if the white with black wire goes to the alternator. Could be wired to the aux output post there. Or start the jeep and turn the key off and check voltage on that wire, if wired from the aux output on the alternator to the ignition once started the key does not cut the voltage. With engine not running there is no voltage on it so you can only test while running.



Troy Cantrell
Sent from my iPhone using Tapatalk
Build thread - '66 CJ6 :
http://www.jeep-cj.com/forums/showthread.php?t=15075
 
If that doesn't do it see if the white with black wire goes to the alternator. Could be wired to the aux output post there. Or start the jeep and turn the key off and check voltage on that wire, if wired from the aux output on the alternator to the ignition once started the key does not cut the voltage. With engine not running there is no voltage on it so you can only test while running.
whssign.gif
Now I remember. This reminds me of another thread where the engine kept running. It was a TeamRush upgrade and a diode was the fix. I realize you may not have had the TeamRush upgrade and a diode may not fix your jeep but I do think Troya is on to something. The alternator may be feeding voltage back keeping the engine running.
Here it is: http://www.jeep-cj.com/forums/f2/ignition-system-electrical-issue-12289/
You turn off the engine but it can't stop instantly. The alternator keeps turning and feeds enough voltage back to keep the ignition running which keeps the engine (and alternator) running.

Try this: Keep the engine off.
If the key is off and you still have voltage on the + wire on the coil, you have a problem with the ignition switch wiring.
If the key is off and you DON"T have voltage on the + wire on the coil then Troya is right and voltage from the alternator is being fed back, keeping the ignition running.

Keep us posted on what you find.
 
Ok first off thank you for the help!! Alright I don't have power to the + side of the coil with key off. The black w/ white wire has nothing with key off turn key on it has power. Start the engine and turn key off it still has power. I haven't traced it yet but im about to. My bet is its running to the alt. I will keep posted.
 
Ok I traced it back to a light bulb in the speedometer cluster WTH! The bulb is blown but I don't know why it's going there
 
The cluster should get power from the ign, that's what causes the cluster to light up when you turn the key.

Disconnect it and see if you are getting voltage through the cluster still. The turn single seems strange but the alternator also connects to the cluster.


Troy Cantrell
Sent from my iPhone using Tapatalk
Build thread - '66 CJ6 :
http://www.jeep-cj.com/forums/showthread.php?t=15075
 
I think voltage is getting fed back from the alternator.
Can you kill the engine by disconnecting the alterantor?
http://www.jeep-cj.com/forums/f2/ignition-system-electrical-issue-12289/

I mentioned to him my problem, but that was before I noticed I could kill the engine by removing the alternator wires.

He responded by telling me that he thought I could kill it that way, and if I could, this is what I needed to do.

The band on the diode must be installed towards the alternator, keeping alternator current from "backflowing" through that wire.
 

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