No high beams - JeepForum.com
Reply
 
LinkBack Thread Tools
post #1 of 16 Old 06-27-2019, 01:49 PM Thread Starter
93zjgrand
Registered User
1993 ZJ 
 
Join Date: Aug 2010
Location: clover
Posts: 169
No high beams

I have low beams but no night beams. The blue light on the dash comes on. I have tried new bulbs... same results. On the low side I have over 12v, on the high side I get about 11.1v. What should I be looking for?

93zjgrand is offline  
Sponsored Links
Advertisement
 
post #2 of 16 Old 06-27-2019, 05:37 PM Thread Starter
93zjgrand
Registered User
1993 ZJ 
 
Join Date: Aug 2010
Location: clover
Posts: 169
I could really use some help
93zjgrand is offline  
post #3 of 16 Old 06-27-2019, 07:59 PM
HighLonesome
Web Wheeler
 
HighLonesome's Avatar
1995 ZJ 
 
Join Date: Feb 2005
Location: New Mexico
Posts: 8,056
A relay not engaging maybe. You should be able to hear it click when turning the HBs on and off. It's located in the PDC under the hood.
HighLonesome is offline  
 
post #4 of 16 Old 06-27-2019, 08:03 PM
SAR-Swimmer
Registered User
1997 ZJ 
 
Join Date: Apr 2009
Location: Mission
Posts: 956
Hi, we could really use some help from you, too. Were they working and just stopped, or never worked ? When you measured high side voltage, where were you measuring, at the light wiring plug ? If you had power at the plug, and no lights, then probably some sort of grounding issue. Make sure plug is clean, and check the ground wires back from plug to where-ever it grounds. Were you working on anything that might have required you to remove a ground, that you didn't put back in place ?
SAR-Swimmer is offline  
post #5 of 16 Old 06-27-2019, 08:53 PM Thread Starter
93zjgrand
Registered User
1993 ZJ 
 
Join Date: Aug 2010
Location: clover
Posts: 169
I'll check for a relay again. But I didn't see one for it... just a fuse. The highs use to work just fine. I measured at the harness plug. I get around 11.5v.
93zjgrand is offline  
post #6 of 16 Old 06-27-2019, 10:29 PM
CatSplat
Registered User
 
CatSplat's Avatar
1994 ZJ 
 
Join Date: Jul 2009
Location: Calgary
Posts: 1,893
Garage
No relay on the ZJ headlight circuit as far as I know - I had to add a relay harness to mine. I'd suspect bad ground or bad headlight switch.

1994 5.9L ZJ | IRO 5.5" CPLA | NP242 | 33" Cooper Discoverer STT Pro
The Jeep of Theseus
CatSplat is offline  
post #7 of 16 Old 06-27-2019, 10:57 PM Thread Starter
93zjgrand
Registered User
1993 ZJ 
 
Join Date: Aug 2010
Location: clover
Posts: 169
Where is the headlight switch located on this model? Are you talking about the light turn on switch on the dash?
93zjgrand is offline  
post #8 of 16 Old 06-27-2019, 11:05 PM
RedRiverT
Registered User
1997 ZJ 
 
Join Date: Nov 2014
Posts: 654
Quote:
Originally Posted by 93zjgrand View Post
Where is the headlight switch located on this model? Are you talking about the light turn on switch on the dash?
Yes, that's what he's talking about, and they're a common failure because the solder on the wire connections cracks and after it vibrates and jars around from road roughness, it can move apart and thus break electrical contact.
RedRiverT is offline  
post #9 of 16 Old 06-28-2019, 06:53 AM
HighLonesome
Web Wheeler
 
HighLonesome's Avatar
1995 ZJ 
 
Join Date: Feb 2005
Location: New Mexico
Posts: 8,056
Quote:
Originally Posted by CatSplat View Post
No relay on the ZJ headlight circuit as far as I know - I had to add a relay harness to mine. I'd suspect bad ground or bad headlight switch.

yea you are right, it's the fogs I was thinking of

I made an entire 12 ga. lighting harness with relays too.
HighLonesome is offline  
post #10 of 16 Old 06-28-2019, 07:22 AM Thread Starter
93zjgrand
Registered User
1993 ZJ 
 
Join Date: Aug 2010
Location: clover
Posts: 169
You can hear it click over to the high beams. The blue dash Light comes also. When you put the highs on.. both lights just go out untill you switch back to lows
93zjgrand is offline  
post #11 of 16 Old 06-28-2019, 07:09 PM Thread Starter
93zjgrand
Registered User
1993 ZJ 
 
Join Date: Aug 2010
Location: clover
Posts: 169
There has to be something someone knows and can help me.
93zjgrand is offline  
post #12 of 16 Old 06-29-2019, 07:11 AM
jeep210
Registered User
1997 ZJ 
 
Join Date: Oct 2009
Location: East Texas
Posts: 261
Getting 11.5 volts at the high beam lead should be enough for your high beam to light up. 12V on low beam and 11.5V on high beam may mean some corrosion build up on the high beam circuit.

You apparently have a ground problem. 11.5V gets to the bulb but no place to go. Disconnect the electrical plug. Do a continuity test from the ground lead to a good ground on engine or frame. You should have continuity. No continuity equals a ground problem.

If you don’t know which lead is for ground, test your bulb, it should be a 9004 if I am correct. It has 3 pins. One on the right is ground. Do a continuity test from ground pin on bulb to other 2 pins. You should have continuity between ground pin and other 2 pins. Indicating bulb is good, high and low beam.

Find the wire for that ground pin and run a temporary ground wire to it. Bulb should turn on on high beam using light switch.

Well I have to edit this rethinking it out. This is where having the wiring diagram helps. The ground is a common ground for low and high beam so I may be wrong here. Do the test as above and see what you get. The problem may be elsewhere. I’ll see if I can find a diagram. My wiring diagram source dried up on me.
jeep210 is offline  
post #13 of 16 Old 06-29-2019, 01:32 PM
GOLDWING
Registered User
 
GOLDWING's Avatar
1998 ZJ 
 
Join Date: Nov 2015
Location: eau claire
Posts: 2,428
11.5 volts is all I ever got at the bulb socket before building my relay harness. Now it is very close to battery voltage.

Your DVM can show 11.5 volts and a bad connection can allow 11.5 to drop to near zero under load. I suggest using a test light or even a known good bulb to check under load.

Reflowing the solder joints on the headlight on/off switch is a good idea.

GW

"The Dude Abides"
GOLDWING is offline  
post #14 of 16 Old 06-30-2019, 08:44 PM Thread Starter
93zjgrand
Registered User
1993 ZJ 
 
Join Date: Aug 2010
Location: clover
Posts: 169
I used a multimeter and put 1 probe in the ground shocker and touched the frame with the other and got continuity. The ground is good. I'm lost.
93zjgrand is offline  
post #15 of 16 Old 07-02-2019, 05:06 AM
jeep210
Registered User
1997 ZJ 
 
Join Date: Oct 2009
Location: East Texas
Posts: 261
What is happening is you are dropping voltage somewhere in the high beam circuit. Make sure you have a good bulb. Try testing each side with just one bulb connected see what you get. You are going to have to do voltage drop testing to find the problem. Hard to understand at times. With a good bulb and circuit on, you should read close to battery voltage at the high beam positive lead. If you read low voltage, bulb does not turn on, then you know you have a voltage drop and circuit problem.

Here is a video I found describing a low-high beam problem and testing. Hope this helps.

VIDEO
jeep210 is offline  
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.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome