Fuse and gauges 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 Wrangler Forums > YJ Wrangler Technical Forum > Fuse and gauges question

Spartan Locker Promo Running now @ ROCKRIDGE 4WD plus FREEG2 Disc Brake Conversion Kit for Jeep Wrangler YJ TJ LJ ChTJ Wrangler 4" Rough Country Suspension Lift Kits in

Reply
Unread 08-08-2008, 10:26 AM   #1
spshultz
Registered User
1987 YJ Wrangler 
 
Join Date: Jun 2008
Location: Anytown, USA
Posts: 369
Fuse and gauges question

1987 4.2L Laredo, 5spd, A/C

I'm trying to troubleshoot an oil pressure gauge that never moves from zero (oh and the clock doesn't work either). All other gauges work fine.

I've ohmed out the sending unit and it reads about 1 ohm with 0 psi. Sprynet says the ohms should be about 234. And I found an old post here on the forums that says you want about 1 ohm with 0 psi. So I'm not exactly sure what it should be.

I tried disconnecting the wire from the sending unit and turning the key on to see if the gauge pegs to the right but it doesn't move.
I also tried grounding the wire that goes to the sending unit and turning the key on and again it never moves.

I checked my fuses and found that the "clock" fuse was blown (well it was the fuse next to the word "clock") so I put a new one in. Clock still doesn't work and the oil pressure gauge is still a no go. Then I found my "dome" fuse blown. Unfortunately I am out of fuses at this time (will have to go get some more after work). Still need to check a few more but I was in a real hurry.

So my question is: Do all the gauges run through one fuse (like "ACC") or through multiple fuses in the fuse block? From the Haynes manual it looks like they all get their power through one fuse which is the "IGN LPS" fuse but it's hard to tell for sure. I really hope the problem is not on the PCB because I don't want to have to pull the dash out.

Any help is appreciated.

Thanks,
Shawn

spshultz is offline   Reply With Quote Quick reply to this message
Unread 08-08-2008, 04:33 PM   #2
NYScrambler
Registered User
1987 YJ Wrangler 
 
Join Date: Mar 2005
Location: Rochester, NY
Posts: 19
Not sure if this is the case with your clock but I've bought a couple of clusters for the 87 thru 91 YJ's for various parts. I noticed the printed circuit "wires" leading to both of the clocks were "melted away". Not a lot may be like an inch or two of missing copper foil. Strangely on my current cluster all of the guages work poorly. Gas gauge doesn't all. Oil pressure gauge drops when I turn on the headlights. I have smack the temperature gauge sometimes to get it to read. The clock however works great!
NYScrambler is offline   Reply With Quote Quick reply to this message
Unread 08-08-2008, 07:18 PM   #3
Burnerman
Registered User
1989 YJ Wrangler 
 
Join Date: Oct 2006
Location: Vernon, NJ
Posts: 4,757
Replace the "dome" fuse. IIRC that sends the 12v to the clock. If you remove the dash plastic overlay around the gauges and htr controls, you'll be able to easily remove the gauge cluster and check the ribbon connector. It's a cheesy setup and you'll probably find corrosion at the least or burnt up ribbons at the worst. Mine has a piece of wire jumping the burnt up feed to my clock. It keeps perfect time. I have the schmatic on the PC if anyone needs it.
I'll just post it:
temp1.gif   temp2.gif  
__________________
89' YJ Larado 4.0L,AX15
05' Grand Cherokee Limited, 2"OME lift and a Hemi.
Burnerman is offline   Reply With Quote Quick reply to this message
Unread 08-08-2008, 07:22 PM   #4
Mean Max
Don't poke the bear
 
Mean Max's Avatar
1991 YJ Wrangler 
 
Join Date: Jul 2007
Location: Stuart, Florida
Posts: 13,682
That's a sweet schematic! I don't need it for myself right now, but it'll be good to have later if I do!

I hope it helps the OP.

Thanks!
__________________
Click here to see all of my different albums on Photobucket.
Choose any album to see all of my pics!


Quote:
Originally Posted by UltimatE View Post
Max has a picture of every Jeep part ever made.
Quote:
Originally Posted by Benderff View Post
No one here knows what they are talking about. You should try Pirate 4x4 they will be happy to help you.

There is no situation that cannot be improved with a small but well-placed explosive.
Mean Max is offline   Reply With Quote Quick reply to this message
Unread 08-09-2008, 05:50 AM   #5
AtzMaBoy
Registered User
1988 YJ Wrangler 
 
Join Date: Jun 2008
Location: W-PA
Posts: 101
That's a keeper! Nice job - Thanks
__________________
1988 YJ, 2.5 4cyl TBI, 5 Speed, 4WD, 31's. Repaired ECU, Herculined. Wrenchin', scrapin', learnin', paintin', enjoy'n! - The "Work in Progress" …continues into '11! (althought she's been on the road since '08! Enjoy it Dad!)
AtzMaBoy is offline   Reply With Quote Quick reply to this message
Unread 08-09-2008, 05:09 PM   #6
spshultz
Registered User
1987 YJ Wrangler 
 
Join Date: Jun 2008
Location: Anytown, USA
Posts: 369
"Dome" fuse it was!! Thank you! The clock now works.

However, the Oil Pressure gauge is still not working. I'm going to order a new sending unit first to see if that has any effect. It looks like the rusty original one is still on it so I'm sure if it was good it won't be for long. Then if the oil pressure still doesn't move then it's dash time. I may try using a mechanical oil pres gauge just to see if I have any (I'm sure I do).
spshultz is offline   Reply With Quote Quick reply to this message
Reply

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


Suggested Threads





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.