Replaced the ignition, same problem. Engine continues to run smoothly. Disconnect battery, engine shuts off.

 

Welcome to the board!

What part of the ignition did you replace? Have you replaced the starter solenoid recently?

The basic ignition should send power to the coil with the key in the run position, usually through a ballast resistor. In the Start position it will bypass the ballast resistor and send the full 12V to the coil. When the key is turned to the Off position power is cut from the ignition ciruit (coil).

It sounds to me that somehow the coil is getting 12V after the key is switched off. The reason I asked about the starter solenoid is because that where the power to the coil comes from. There is a chance, albeit rare, that the ignition wire to the coil is shorted out to a 12V source. I doubt that but it could happen. My bet is that its wired wrong.

How long have you had the truck? what all have you done to it?

Hopefully someone will post a schematic of the system, its hard to describe with just words.

Bobby

 

with ign off and engine running unplug small ign wire from solenoid if it don't shut down check voltage reg

 

Check to see if the Power Wire coming in from the battery lug on the starter solenoid is connected to the "B" post on the ignition switch. You should have four posts on that ingnition switch: B (battery) I (or IGN for Ignition) A (or ACC for Accessories) and S (or ST for starter. Check your hook ups. Sounds to me like you have the hook ups flip flopped. Here's a picture of the wiring:




Julie

PS Note that the chargin gsystem wiring is for Alternator, not generator. Also, you do not have a separate start switch. So the wire coming from the start switch and going to the starter solenoid in the picture above is actually hooked the S terminal on your ignition switch.

 

I had that happen to me when I replace the generator with an alternator. Come to
find out, the ign wire to the alt. regulator feed back to the coil keeping the coil
energized. Two ways to correct that, are to put a diode in line, or a small pilot lamp.
Other than that, as mentioned above, the only signal has to come from the solonoid.
sam

 

grab the coil wire and yank it off. be sure to grab down near the coil.

 

Careful now, this thread is 14 years old.

 

I hope by now the guy could shut his truck off.... I guess it ran out of gas.

 

i just want to see if someone tries to pull the wire off.