Side marker led lights dim when marker lights on

[squarebfan]

Hi there, so I swapped all bulbs to led.
Installed the led flasher , turn signals flash bright when no lights on. Once I turn marker lights on the side markers are dim even if I turn blinker on with markers on.
Do I need a resistor on the side marker or what can I do?
Thanks

 

[RiverRat4]

something Ive learned after throwing money at problems is always confirm your ground connections! Dimming lights under load sounds like a ground issue to me, but that's just an off the cuff answer.

 

[squarebfan]

I also have removed all ground cables and cleaned area

 

[Sad Sack]

Interesting thread in regards to LED upgrades: https://www.gmsquarebody.com/threads/led-conversion.46300/#post-982795

 

[AuroraGirl]

Hi there, so I swapped all bulbs to led.
Installed the led flasher , turn signals flash bright when no lights on. Once I turn marker lights on the side markers are dim even if I turn blinker on with markers on.
Do I need a resistor on the side marker or what can I do?
Thanks

what do you mean by DIM? you have no light or its barely lit?
are you saying they are never fully bright?

You may have gotten cheap LEDs.
you also may have LED 194 which are only going to work in either function but not both. they make ones that can do both. by both, i mean sidemarker and then alternates with turn signal. the way its done electrically is the 194 receives 12 volts on both sides of the bulb when it "flashes" and its grounded on one side when its just park lamp/sidemarker.

Then when you reverse the bulb, youll get the opposite behavior.

 

[TotalyHucked]

^Was gonna link that thread. Good info

 

[Jgonick]

you also may have LED 194 which are only going to work in either function but not both. they make ones that can do both. by both, i mean sidemarker and then alternates with turn signal. the way its done electrically is the 194 receives 12 volts on both sides of the bulb when it "flashes" and its grounded on one side when its just park lamp/sidemarker.

This ^^^^

LEDs -light emitting diode- diodes only let current run one direction (unless they have been modified some how)

 

[Rickf]

My vote is for the wrong type of LED 194 bulbs. I had a similar issue and solved it with the "correct" LED's.

 

[squarebfan]

what do you mean by DIM? you have no light or its barely lit?
are you saying they are never fully bright?

You may have gotten cheap LEDs.
you also may have LED 194 which are only going to work in either function but not both. they make ones that can do both. by both, i mean sidemarker and then alternates with turn signal. the way its done electrically is the 194 receives 12 volts on both sides of the bulb when it "flashes" and its grounded on one side when its just park lamp/sidemarker.

Then when you reverse the bulb, youll get the opposite behavior.

Yes it's barely lit, it is fully bright when I'm only using the blinker without any other lights on.
I tried uploading a couple videos of them but it's not letting me

 

[squarebfan]

My vote is for the wrong type of LED 194 bulbs. I had a similar issue and solved it with the "correct" LED's.

What type of led bulb is it that I need to get?