LED trun signal issue

[schmoupe]

I have been converting all lights to LEDs over time and this is the first time I am getting a weird issue. I changed my taillights completely to full LED units (instead of just bulbs). To avoid getting hyper flash I changed the dash relay (EP-26). Next I changed my fender flares and with those I also changed the bulbs in them to LED's. No issues.

Last night, I changed the old bulbs in my turn signals (rectangle lights under headlights) to LED 1157's and immediately got the bulb out indicator. Green lit arrow in dash. Changed them back to old bulbs and all good. I thought the new relay should have saved me from the light out indicator? any thoughts?

 

[Tangerined]

It's due to how the side markers are wired. LEDs interfere with how that circuit works.

https://wranglertjforum.com/threads...k-without-headlights-running-lights-on.11947/

 

[Jerry Bransford]

I have been converting all lights to LEDs over time and this is the first time I am getting a weird issue. I changed my taillights completely to full LED units (instead of just bulbs). To avoid getting hyper flash I changed the dash relay (EP-26). Next I changed my fender flares and with those I also changed the bulbs in them to LED's. No issues.

Last night, I changed the old bulbs in my turn signals (rectangle lights under headlights) to LED 1157's and immediately got the bulb out indicator. Green lit arrow in dash. Changed them back to old bulbs and all good. I thought the new relay should have saved me from the light out indicator? any thoughts?

The EP-26 LED relay ONLY fixes the fast flash problem caused because LED bulbs don't draw enough current to allow the stock turn signal relay to flash at its normal speed.

What the EP-26 LED relay doesn't fix are problems caused because LED bulbs are not only light bulbs, they are also light-emitting DIODES which only allow current to flow in one direction. Some circuits like the turn signal and side marker lights need the bulbs to be able to conduct/pass current in both directions. The current needs to be able to flow through those bulbs in alternate directions depending on the position of the headlight switch. An LED bulb prevents that which will give different symptoms depending on which way you wired it into the circuit.

There is one way to get around that problem by installing a bridge rectifier for each bulb so current only flows through it in one direction but personally I'd just run a standard incandescent bulb in those types of circuits.

 

[John Scoggins]

The PO installed LED's in the TJ that I purchased, that was the second "un mod" that I did was to replace the with the correct incandescent bulbs.

 

[schmoupe]

The EP-26 LED relay ONLY fixes the fast flash problem caused because LED bulbs don't draw enough current to allow the stock turn signal relay to flash at its normal speed.

What the EP-26 LED relay doesn't fix are problems caused because LED bulbs are not only light bulbs, they are also light-emitting DIODES which only allow current to flow in one direction. Some circuits like the turn signal and side marker lights need the bulbs to be able to conduct/pass current in both directions. The current needs to be able to flow through those bulbs in alternate directions depending on the position of the headlight switch. An LED bulb prevents that which will give different symptoms depending on which way you wired it into the circuit.

There is one way to get around that problem by installing a bridge rectifier for each bulb so current only flows through it in one direction but personally I'd just run a standard incandescent bulb in those types of circuits.

This is the kind of knowledge and post quality one can wish for and often is given in this forum. Thank you! Looks like LEDs are going in a drawer for now and old bulbs are getting installed. Thanks all