Turn Signal Not Working - 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 01-24-2020, 11:03 PM
Thread Starter
  #1
Newb
 
Join Date: Jun 2019
Posts: 4
Lightbulb Turn Signal Not Working

Hello, I have a 00 2.5l 4cyl and I am having problems with the passenger side turn signal.

The problem is that it will not blink but it will turn on if I have the headlights on. When the headlights are on the right turn signal indicator on the dashboard stays green as well.

I have replaced the bulbs in the front turn signal, and the side indicator light. I have replaced the side indicator light housing bc that light wouldn't light up before. Fuses are good, and I just replaced the turn signal flasher in the dash behind the steering wheel. This has been an issue for me for months and I would appreciate any help you could give. Thanks

Hallerbit is offline   Quote
Old 01-24-2020, 11:24 PM   #2
Jeeper
 
RUBI 4 MY MRS's Avatar
 
Join Date: Feb 2011
Location: Trails of Nevada
Posts: 3,396
The side marker works through a "floating ground" to the front parking light on that side. A sure sign of a bad ground at the parking light is when the indicator stays on solid when the lights are on. That is caused by the marker light back feeding through the signal wire to the indicator.

Check the front socket for corrosion or a break in the wires between the side & front lights. It may also be caused by a bad front bulb but you have already replaced it so can rule that out.

__________________


'05 Rubi TJ Unlimited
'93 Toyota 4Runner
RUBI 4 MY MRS is online now   Quote
Old 01-26-2020, 09:10 AM   #3
Jeeper
 
rgreen65's Avatar
 
Join Date: Aug 2014
Location: S. Georgia
Posts: 6,250
The side marker light have no ground. The term "floating ground" means simply there is no ground. When the parking lights are off, and the turn signal is flashing, the side marker flashing light is in sync with the front turn signal (when the front is on, the side is on, when the front is off, the side is off).

When the lights are on, the side marker turn signal flashes the oposite of the front turn signal. (When the front turn signal is on, the side is off and when the front signal is off, the side is on).

This comes about by using the "other" wire in the side marker as a ground. Juse as when you have a bad ground on the rear light and you have the lights on and hit the brakes, the light goes off. The current flows in one wire of the side marker and out the other to seek a ground.

This works fine when the parking lights are on. Of if you are using the turn signals and the parking lights are off. But, when the parking lights are on and you are using the turn signals, for the moment that both systems are energized, you have +12v on both wires and current cannot flow so the side marker lights go dark. When the flasher opens the circuit, the side marker lights up.

1. With the flashers off, and the parking/head lights on, does the side marker light up?

2. Is the new bulb you have installed by chance an LED bulb?

The fact that the turn signal indicator on the dash stays on, indicates that the system thinks a bulb is out. With the exterior lights off, activate the turn signals on that side and check all three bulbs (tail, front fender and side marker). Do all three flash?

LED bulbs will not work with a floating ground. By their nature (being a diode) they will pass current in only one direction. So, without rewiring that light to put a full wave diode bridge in the circuit, either the side marker light will work or the turn signal will work, but not both.
__________________
2003 Light Khaki TJ Rubicon, Manual, Soft Top
2015 Anvil JKU Sahara, Auto, Hard Top - Traded
2017 Chief JKU Chief, Auto, Hard Top
rgreen65 is offline   Quote
Sponsored Links
Advertisement
 
Old 01-26-2020, 02:57 PM   #4
Jeeper
 
RUBI 4 MY MRS's Avatar
 
Join Date: Feb 2011
Location: Trails of Nevada
Posts: 3,396
That’s a very good explanation & mostly correct but allow two small clarifications. A floating ground does not mean no ground, it means no dedicated ground. As you say, the side marker grounds through one of the 2 wires going to the front parking light. If either of those 2 wires is open to ground the system will not work (correctly). It can be open from a bad bulb but only at the front light for the indicator to stay on solid when the lights are on. The rear light is isolated from that part of the circuit at the multifunction switch. And if the side marker bulb is bad it will not need a ground path so no solid signal indicator.

When you turn the lights on the side marker is energized & needs the signal wire (of the 2) to ground for the light to light. If that path through the front light signal bulb is blocked it will feed back to the signal indicator causing it to stay on solid (the indicator bulb is now grounding the marker light rather than the parking light bulb). The blocked ground path can then be from a bad bulb or corrosion at the bulb socket for the front parking light. It could also be damage to the wires running between the lights.
__________________


'05 Rubi TJ Unlimited
'93 Toyota 4Runner
RUBI 4 MY MRS is online now   Quote
Old 01-27-2020, 06:09 PM
Thread Starter
  #5
Newb
 
Join Date: Jun 2019
Posts: 4
Quote:
Originally Posted by rgreen65 View Post


1. With the flashers off, and the parking/head lights on, does the side marker light up?

2. Is the new bulb you have installed by chance an LED bulb?

The fact that the turn signal indicator on the dash stays on, indicates that the system thinks a bulb is out. With the exterior lights off, activate the turn signals on that side and check all three bulbs (tail, front fender and side marker). Do all three flash?



To answer your questions,
#1 yes the side marker lights up. (nvm)

#2 No, I bought just regular side bulb, was not about to spend 11+ dollars on something i could get for 4 lol. Not that I am against led.

I just went out to my jeep and activated the turn signal (with the exterior lights off) and neither the front or side marker activated.
Then to test, I turned on the exterior lights and neither turned on also. Aint that a b****

This morning when I left for school the side marker was working, now when I turn on the exterior lights neither the front or side indicator lights turn on. I replaced the side indicator light housing recently and I didn't notice corrosion when I replaced the front turn signal bulb.

I am thinking I may need a new wiring harness for that front section, but I am not sure
Hallerbit is offline   Quote
Old 01-27-2020, 06:16 PM
Thread Starter
  #6
Newb
 
Join Date: Jun 2019
Posts: 4
Thank you for your input. I think there may be some damage to the wires. Granted it is a 20 y/o vehicle. (off topic but) Is there any preventative maintenance I should worry about for my engine? Along the lines of replacing vacuum lines etc. etc.

Hallerbit is offline   Quote
Reply

Tags
indicator , light , signal , turn

Thread Tools

Posting Rules
You may not post new threads
You may not 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






All times are GMT -5. The time now is 11:21 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC.
Wranglerforum.com is not in any way associated with FCA US LLC.