1997 TJ error code #47 - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 12-16-2007, 06:37 PM   #1
Newb
 
Join Date: Sep 2007
Location: texas
Posts: 6
1997 TJ error code #47

This error code reads: "Battery voltage sense input below target charging during engine operation. Also, no significant change detected in battery voltage during active test of generator output circuit."

My question is: What does this mean?

PCM, Alternator or battery? The battery holds a charge. I had the alternator tested at AZ in september and it was (according to them) working properly.

About 2 weeks ago, the devil came back for his annual TJ visit, and the battery has been lasting for about 2 days before I need to recharge it. When I start the jeep, the "check gauges" light comes on the dash, and the volt meter drops to zero.

Your assistance is appreciated.

Harry in San Angelo

HarryJeeper61 is offline   Quote Quick Reply
Old 12-16-2007, 06:41 PM   #2
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 33,111
Images: 2
Have your battery load tested which is the only real true test of its health. I'd suspect your battery is maybe going bad which can cause strange symptoms, at least that would be the first thing I would suspect. Once you isolate the problem either to the battery or that it's not the battery, then you can suspect something else like the alternator.

All this is assuming you've already cleaned and tightened the battery connections which can also cause hard to diagnose problems.

__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 12-30-2007, 02:24 PM   #3
Newb
 
Join Date: Sep 2007
Location: texas
Posts: 6
Jerry,

I just had the battery tested at autozone. They said they beside for being a bit low on charge, it was ok. I've cleaned all the connections.

I started it up and the same code and symptoms.

I flash cleaned the PCM this morning, and the symptoms still exist.

I tried a trick that used to work with my CJ's: Start the engine and remove the positive battery cable. The engine died immediately.

Does this signify on the TJ that the alternator is bad?

Or?

Thanks for your help.

Harry
HarryJeeper61 is offline   Quote Quick Reply
Old 12-30-2007, 03:27 PM   #4
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 33,111
Images: 2
The TJ's alternator will not work at all without the battery connected like the generator your CJ had will. An engine with a generator will continue to run without a battery, but not one with an alternator. At least not the type of alternator the TJ uses. Disconnecting the battery will alway kill the engine of a modern vehicle that has an alternator of the common type a TJ uses. In fact, disconnecting the battery from an alternator if the engine was running can even conceivably damage the alternator.

The volt meter dropping to zero when you try to start the Jeep indicates either the battery is not as good as Autozone is indicating it is, or you have a bad/weak/corroded connector somewhere in the battery, engine ground, battery to ground, or connection at the starter. I would start by removing, cleaning/brushing every heavy wire connector, then reconnecting them tightly. A bad connection can cause the dash voltage meter to drop to zero under load just like a bad battery can.
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 12-30-2007, 07:53 PM   #5
Jeeper
 
Rawkon's Avatar
 
Join Date: Apr 2005
Location: fullerton/big bear
Posts: 2,061
Send a message via AIM to Rawkon Send a message via MSN to Rawkon
you need to check your voltage regulator. there is also a battery temp sensor under your battery tray. that also regulates your charge rate.
Rawkon is offline   Quote Quick Reply
Old 12-31-2007, 12:34 AM   #6
Jeeper
 
Chad P's Avatar
 
Join Date: Jun 2007
Location: Westminster, Co
Posts: 380
You can take your alternator to auto zone and have it checked too. To be honest with you I replace it. I have limousines and when the alternator starts to go bad they can cause some strange things. You can have some diods inside they may be bad.

Get an alternator with a lifetime warranty that way this is your last purchase. Well worth the extra money. and by the way I would stay away from autozone electronics go with napa carquest ot advance auto IMO better stuff.
__________________
2003 Wrangler TJ
All stock for now!
Chad P is offline   Quote Quick Reply
Old 12-31-2007, 12:37 AM   #7
Jeeper
 
Chad P's Avatar
 
Join Date: Jun 2007
Location: Westminster, Co
Posts: 380
Don't Jeep have internal regulators in the alternator??
__________________
2003 Wrangler TJ
All stock for now!
Chad P is offline   Quote Quick Reply
Old 12-31-2007, 01:52 PM   #8
Newb
 
Join Date: Sep 2007
Location: texas
Posts: 6
Thanks for all your replies. I'm thinking, with the age and history of this Texas ranch jeep, I'm going to start with the battery and replace it. The alternator on this 97 TJ 4cyl jeep is "externally regulated", which means that the VR is inside the PCM.

I'll also replace the alternator and get a life time warranty for it. Finally, if that doesn't do it, then I'll have to look at the PCM <shudder>

I'll also start out first by removing all my cables and wires and cleaning them. I did the top ends yesterday, might as well do the lower ends today.

Who ever said technology was better? :-) Just about the time I got my old CJ's figured out, along them come with a newer jeep.

Happy New Year!

Harry

HarryJeeper61 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum 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 email address for yourself.
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

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
1997 wrangler instrument panel dead finest20 TJ Tech Forum 31 11-04-2014 05:31 PM
1997 Jeep Sahara Alabama mac3kuby Classifieds Archive 4 07-06-2008 11:25 AM
(WV) 1997 SAHARA 5spd 101K $6500.00 Vector6 Classifieds Archive 0 12-30-2007 11:14 AM
Wiring a 1997 Hardtop to a 2006 TJ? halfbaked TJ Tech Forum 4 12-06-2007 09:57 AM
Great DD: 1997 Jeep Grand Cherokee Laredo $4600 tweba99 Classifieds Archive 0 11-17-2006 11:09 AM



Download our Mobile App

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 07:31 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC