Front Turn Signals only work with headlights on - JeepForum.com
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post #1 of 8 Old 10-25-2021, 10:21 PM Thread Starter
DoodlesTJ
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Front Turn Signals only work with headlights on

Hey all,

So recently I noticed my front turn signals will only work with the parking or headlights on as well.

FYI I have LEDs all around and have the appropriate relay. See pictures. Rear turn signals work fine, front turn signal and markers work only when the other lights are on. Any ideas why?

Thanks

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-'06 TJ converted to a Rubicon
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post #2 of 8 Old 10-26-2021, 10:43 AM
Dale M.
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Check ground connection for turn signals and headlight....
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“Fear The Government That Wants To Take Your Guns" - Thomas Jefferson.
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post #3 of 8 Old 10-26-2021, 11:26 PM Thread Starter
DoodlesTJ
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Tried checking the grounds but couldn't solve it that way

I made two bridge rectifiers quickly with 4 diodes and got it all working. Only issue is that the lights are very dim... not sure if that's the voltage drop from the rectifier... seems to go from 8V to 7V

Yet if I rectified just one of the lights (marker OR turn signal) then it would be bright but still 7V while the other light was off. But when I rectified both they would both be dim... even though they'd both get about 7V.
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post #4 of 8 Old 10-27-2021, 02:25 PM
Jonny Jeep
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If you are only getting 7-8V with your bridge rectifier circuit you have a bad ground, or a voltage drop on the positive side of the circuit. A bridge rectifier should only drop around 1V so even with the engine off, with a good battery you should still be getting around 11-12V across the LEDs.
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post #5 of 8 Old 10-27-2021, 09:09 PM Thread Starter
DoodlesTJ
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Quote:
Originally Posted by Jonny Jeep View Post
If you are only getting 7-8V with your bridge rectifier circuit you have a bad ground, or a voltage drop on the positive side of the circuit. A bridge rectifier should only drop around 1V so even with the engine off, with a good battery you should still be getting around 11-12V across the LEDs.
Good to know, thanks for the help. Do you know where this system is grounded? I have a black ground wire coming from the car. There's also a screw that goes into the back of the grille right near the headlight. But that seems fine.

Can I test that black ground wire by doing a continuity test between that wire and the - on the battery?
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post #6 of 8 Old 10-28-2021, 09:51 AM
Dale M.
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Quote:
Originally Posted by DoodlesTJ View Post
Good to know, thanks for the help. Do you know where this system is grounded? I have a black ground wire coming from the car. There's also a screw that goes into the back of the grille right near the headlight. But that seems fine.

Can I test that black ground wire by doing a continuity test between that wire and the - on the battery?
Yes... Should show almost no resistance.

Don't understand the 7-8 volt thing at lamps, should read 12 volts....

“Fear The Government That Wants To Take Your Guns" - Thomas Jefferson.
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post #7 of 8 Old 10-28-2021, 10:35 AM Thread Starter
DoodlesTJ
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Quote:
Originally Posted by Dale M. View Post
Yes... Should show almost no resistance.

Don't understand the 7-8 volt thing at lamps, should read 12 volts....
Thanks. Didn't get a chance to test last night but hopefully will tonight after work. I'll let you know
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post #8 of 8 Old 10-31-2021, 08:29 PM Thread Starter
DoodlesTJ
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I think it was just my wiring. I played around with it a lot, and basically got it working.

On the 3 wire LED:
White wire - GND (chassis)
Black wire - 12V hot wire for when headlights are on
Red wire - Intermittent turn signal ~8V or 0V

And I realized the two wire marker lights could only be used as a marker OR turn signal so I'm just going to buy another 3 wire LED to put in the marker

Only weird thing is this: when the headlights and turn signals are on the light is still bright even in between flashes. You can tell it's flashing but the light never goes off in between the flashes. I'll live with it

Thanks for your help everyone

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