Will not power off

Tiny
MSTERLING
  • MEMBER
  • 1979 JEEP CJ7
  • V8
  • 4WD
  • AUTOMATIC
  • 80,000 MILES
Start the vehicle starts perfect idles perfect runs perfect turn the key off remove it it stays running. We have replaced the starter solenoid, we have replaced ignition switch still nothing. I have got with the key on and off I do have voltage for some reason like 8.4 volts going to the solenoid and I cannot figure out why I have got constant power there. Please help. I have also had it running and took the white plug off the alternator to make sure it was not feedback from the alternator and it stays running it does not shut off when I do that. So it is not the alternator as far as I understand giving feedback.
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Thursday, October 4th, 2018 AT 9:19 AM

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Tiny
CJ MEDEVAC
  • EXPERT
Look closely at my first diagram.

The resistance wire and "I" wire are kind of the same wire.

The "Tee" in the line goes to the coil.

Operation

Key on--Resistance (8.4 volts) feeds the coil + plus the continuation over to "I" wire.

"I" terminal is bad. The volts are coming from the resistance wire (key on)

Now we crank!

Starter turns.

"I" now comes alive with full battery voltage.

The coil is now getting full battery voltage as a "boost" while the starter is robbing power. Resistance wire is getting it kind of backwards (which does nothing).

It fires off!

You let go of the key.

Starter stops turning.

"I" Terminal shuts off.

Power to the coil is now coming from the resistance wire (reduced voltage to keep from burning up the ignition module).

What? Yes, the "I' wire is getting that voltage too, It does nothing for the solenoid, it just happens to be the continuation of the resistance wire.

I will continue with my suspicions when I get back from chow!

The Medic
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Thursday, October 4th, 2018 AT 4:27 PM
Tiny
CJ MEDEVAC
  • EXPERT
Here is possibilities for not shutting off.

Somehow the coil is being fed voltage.

Something hot is tied into the wiring for the coil.

Solenoid is not wired right.

The ignition switch may need to slide a bit forward or rearward.

Trace out the resistance wire ("I" wire also) see if someone tied something extra onto them. It should look like the diagram.

First two diagrams are the solenoid. Third is bumping (the reason my stuff is opposite from original. The big posts do not care which side the starter cable is on. As long as the starter cable is by itself on the chosen post. I wire mine as in my pictures (backwards from original). For me, this will allow me to bump or start the Jeep with a screwdriver from the battery cable side against the "S" terminal. The original way will not allow the screwdriver to reach "S".

I have a diagram for a 1979, it is probably about the same for an 1980 and 1981.

I am going to send several diagrams. Keep in mind I had to color all of the wires in "Microsoft paint" from two pages scanned from a manual. I did this years ago. Colored markers used in a manual with lines close together just never did cut it when following wires!

Solid colors are correct. White wires show up black. Along the wires somewhere it is written the color.

Note: Wires with stripes or color tracers are colored with the correct "main" color. The diagram did not denote what the color of the stripe was. I made "dashes" on these wires just to let you know it does have a tracer stripe-color unknown. You will see this. You will get used to it.

In these diagrams, the 304 is shown top left. However, it shares the rest of the wiring with the 258 six cylinder (Like I have).

I "rob" parts of the diagrams to explain things, you will see this with my ignition diagram.

I had the office store blow up my two pieces, I mated them (they overlap) and had the whole deal laminated. About $25.00, it was well worth it in tracing things out.

Overwhelmed?

I can maybe slow down some, I will be happy to try to explain better. I am here just as long as it takes to get you squared away. Some go on for months! CJs are my cup of tea!

Your turn,

The Medic
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Thursday, October 4th, 2018 AT 7:21 PM

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