Voltage coming into ignition switch question. - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Liberty Forums > KJ Liberty Forum > Voltage coming into ignition switch question.

Spartan Locker Promo Running now @ ROCKRIDGE 4WD plus FREEG2 Disc Brake Conversion Kit for Jeep Wrangler YJ TJ LJ ChSave 15% in XT's Pre-Black Friday Event!

Reply
Unread 10-04-2012, 08:01 PM   #1
Apachebear
Registered User
2002 KJ Liberty 
 
Join Date: Oct 2012
Location: Reno, NV
Posts: 11
Voltage coming into ignition switch question.

Why is there a voltage dropoff on the lines coming into the ignition switch? When I first touched them they were bright on the test light. Then they dimmed out. Then they went out completely.

Apachebear is offline   Reply With Quote Quick reply to this message
Unread 10-05-2012, 01:41 AM   #2
Billwill
Registered User
2002 KJ Liberty 
 
Join Date: Jul 2007
Location: South Africa
Posts: 1,035
Quote:
Originally Posted by Apachebear View Post
Why is there a voltage dropoff on the lines coming into the ignition switch? When I first touched them they were bright on the test light. Then they dimmed out. Then they went out completely.

Should not be any voltage drop at all but then again I do not believe in test lights...you need a proper Digital or Analogue Multimeter to trace voltage drops and other electronic issues.

Check the ground you are using for your test lamp.
__________________
2002 2.5 Export CRD Manual 5 speed.
Billwill is offline   Reply With Quote Quick reply to this message
Unread 10-05-2012, 01:31 PM   #3
Apachebear
Registered User
2002 KJ Liberty 
 
Join Date: Oct 2012
Location: Reno, NV
Posts: 11
Okay yeah. Didn't think of that. I will go into storage and dig out my multimeter and try that. The reason I need to know is I'm trying to figure out if its the ignition switch or the computer at this point.
Totally silent turning key. Battery is brand new (Group 34).

....will update soon

Thanks,
Bear
Apachebear is offline   Reply With Quote Quick reply to this message
Unread 10-06-2012, 04:35 AM   #4
Billwill
Registered User
2002 KJ Liberty 
 
Join Date: Jul 2007
Location: South Africa
Posts: 1,035
Quote:
Originally Posted by Apachebear View Post
Okay yeah. Didn't think of that. I will go into storage and dig out my multimeter and try that. The reason I need to know is I'm trying to figure out if its the ignition switch or the computer at this point.
Totally silent turning key. Battery is brand new (Group 34).

....will update soon

Thanks,
Bear
There are lots of posts like this and the cause was a broken actuator pin that moves the ignition switch.

If you have already removed the ignition switch, have a look if the actuating pin...plastic or metal...has broken.

You can start the jeep by having the ignition key in its slot...to unlock steering and to activate SKIM and then turn the ignition switch itself with a flat screwdriver.

If you have a broken actuator....report back here for advice on where to get a new one at a good price
__________________
2002 2.5 Export CRD Manual 5 speed.
Billwill is offline   Reply With Quote Quick reply to this message
Unread 10-06-2012, 06:47 PM   #5
Apachebear
Registered User
2002 KJ Liberty 
 
Join Date: Oct 2012
Location: Reno, NV
Posts: 11
Actuator pin isn't broke, looks great. Put key in slot, turned to on. With Battery hooked up. Plugged ignition switch back in and grounded it. put screwdriver in ignition switch and turned. No go.. So possible ignition switch bad?
Also no power to dash or anything internal.
Apachebear is offline   Reply With Quote Quick reply to this message
Unread 10-06-2012, 07:30 PM   #6
Apachebear
Registered User
2002 KJ Liberty 
 
Join Date: Oct 2012
Location: Reno, NV
Posts: 11
Taking off tomorrow to go buy a Group 34 with over 600 cca Battery from Batteries Plus +. Read something about the PCM sensor and oil sensor, etc. not working if you don't have the correct Battery.
Apachebear is offline   Reply With Quote Quick reply to this message
Unread 10-07-2012, 03:20 AM   #7
Billwill
Registered User
2002 KJ Liberty 
 
Join Date: Jul 2007
Location: South Africa
Posts: 1,035
Quote:
Originally Posted by Apachebear View Post
Taking off tomorrow to go buy a Group 34 with over 600 cca Battery from Batteries Plus +. Read something about the PCM sensor and oil sensor, etc. not working if you don't have the correct Battery.

You would expect to at least get the dash lights on even with a slightly weaker battery.

When you get your new battery, make sure the battery terminals are clean and very tight and check the battery ground going to chassis is clean and tight and check the grounding strp grounding the engine to chassis is clean and tight.

I presume you have checked all fuses...under the hood and inside the cabin?
__________________
2002 2.5 Export CRD Manual 5 speed.
Billwill is offline   Reply With Quote Quick reply to this message
Unread 10-07-2012, 03:22 AM   #8
Billwill
Registered User
2002 KJ Liberty 
 
Join Date: Jul 2007
Location: South Africa
Posts: 1,035
Double post
__________________
2002 2.5 Export CRD Manual 5 speed.
Billwill is offline   Reply With Quote Quick reply to this message
Unread 10-10-2012, 08:14 AM   #9
JeepCares
Registered User
 
Join Date: Jan 2012
Location: MOPAR World Headquarters, Chrysler Group LLC
Posts: 2,511
I'm not good with electrical and I'll be the first to admit it. Not sure exactly what diagram would help. Would any of these help - or would you need something else?
02-kj-ground-distribution.gif   02-kj-ig-switch.gif   02-kj-power-distribution.gif  
__________________
U.S. Top Care
Chrysler Group LLC
JeepCares is offline   Reply With Quote Quick reply to this message
Unread 10-11-2012, 05:34 AM   #10
Billwill
Registered User
2002 KJ Liberty 
 
Join Date: Jul 2007
Location: South Africa
Posts: 1,035
I would start with this diagram showing the ignition switch itself.....measure the voltage coming into the plug and looking for it on the same contact coming out of the plug.
img.jpg  
__________________
2002 2.5 Export CRD Manual 5 speed.
Billwill is offline   Reply With Quote Quick reply to this message
Unread 10-11-2012, 07:57 AM   #11
streetglideok
Registered User
2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Colorado Springs, Colorado
Posts: 2,426
Quote:
Originally Posted by Apachebear View Post
Why is there a voltage dropoff on the lines coming into the ignition switch? When I first touched them they were bright on the test light. Then they dimmed out. Then they went out completely.
Test lights, and glorified test lights(power probes), have their uses, but for the problems you are having, are best left in a drawer. A good digital multimeter or graphing meter(even better), is what you need. Make sure you have the correct battery size, and it is good, and that the connections are tight, and spotlessly clean. There's hundreds of posts with problems similar to yours, all due to poor battery connections, FYI. Make sure you have a good grasp on how to measure voltage drops, etc as well.
streetglideok is offline   Reply With Quote Quick reply to this message
Unread 10-12-2012, 12:08 AM   #12
Apachebear
Registered User
2002 KJ Liberty 
 
Join Date: Oct 2012
Location: Reno, NV
Posts: 11
New Battery

Bought another new battery. This one is from Batteries Plus+. Group 86, has 690 cca. Actually got milage lights for a few seconds. Tried starting it and all went dead silent again. (Battery still okay tho).
Studying the wiring on the PCM and ignition switch. That will be my next purchase I think unless someone can think of something else.

Forgot to mention. About a week before .. the rear tailgate was clicking and window wouldn't close and door wouldn't open. Tow Truck guy and myself took out a fuse and it started. That worked to start the car for about a week. Then this happened.

That's what's strange too. It started up just fine, we shut it off to wait for someone, then nothing. silent. kaput.

Thanks...
Apachebear is offline   Reply With Quote Quick reply to this message
Unread 10-12-2012, 12:10 AM   #13
Apachebear
Registered User
2002 KJ Liberty 
 
Join Date: Oct 2012
Location: Reno, NV
Posts: 11
No voltage to ignition

OH....also...It is driving me crazy why I'm not getting any power to the ignition. Yep, Battery is tight, multimeter used to measure.
Apachebear is offline   Reply With Quote Quick reply to this message
Unread 10-12-2012, 02:13 AM   #14
Billwill
Registered User
2002 KJ Liberty 
 
Join Date: Jul 2007
Location: South Africa
Posts: 1,035
Quote:
Originally Posted by Apachebear View Post
OH....also...It is driving me crazy why I'm not getting any power to the ignition. Yep, Battery is tight, multimeter used to measure.

If you look at the diagram I supplied, Fuse 14, Fuse 13 and Fuse 8.

Then all three of these leads go through connector C100 which is a gray connector located inside the left kick panel...check that the contacts are clean and tight at this connector.


And just to repeat...make sure the negative battery cable goes firmly and cleanly to the chassis and check the grounding strap grounding the engine to the chassis.

The clicking noise you hear at the tailgate is a symptom of weak battery or bad battery connection.
__________________
2002 2.5 Export CRD Manual 5 speed.
Billwill is offline   Reply With Quote Quick reply to this message
Unread 10-12-2012, 08:02 AM   #15
streetglideok
Registered User
2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Colorado Springs, Colorado
Posts: 2,426
Yep sounds like voltage drop at the battery cables, either ground or positive. Even with a voltage drop, if you are only checking for voltage at the battery, it will say 12v all day long. How about some pics of your battery cable ends, and the battery, and post them on here?
streetglideok is offline   Reply With Quote Quick reply to this message
Reply

Tags
2002 , jeep , liberty

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.