Front marker lights

[Donald Mitchell]

1990 c1500 first problem Ive had with these, both sides not working. Changed turn signals to led, then noticed these were out. Good bulbs just redid all grounds. The wires are blue and brown no ground, diagram looks like they ground through the headlight circuit. Still working on completing the interior and only fuse out is the courtesy lights till i get the door panel back in.

 

[618 Syndicate]

So what's not working? The LED's you just installed?

 

[Donald Mitchell]

No its just the marker lights, I am seeing other things now, both flasher indicator lights are on and the turn signals aren't working either. I may have to look into the wiring again this weekend and see if something got pinched. I had reloomed all the wiring infront of the radiator support when I was painting it. I cleaned and inspected all the wires, and all looked good and worked fine afterwards, but who knows. Oh, ai also have cats, so that might be the answer right there.

 

[618 Syndicate]

Swap the LED's back out and see if the problem goes away. I'll bet it does.

 

[Donald Mitchell]

I'll try it, Thanks.

 

[sewlow]

LEDs are polarity sensitive. Have you tried re-installing them 1/2 in the socket?

 

[AK49BWL]

You need load resistors on the blinker circuits, LEDs don't pull enough current for the flasher units to operate correctly. You may also need an electronic flasher to keep from getting the bulb-out hyper-flash.

And before anyone goes calling BS, I've tried every other method to make them work - it WILL NOT WORK WITHOUT LOAD RESISTORS.

 

[Supercharged111]

You need load resistors on the blinker circuits, LEDs don't pull enough current for the flasher units to operate correctly. You may also need an electronic flasher to keep from getting the bulb-out hyper-flash.

And before anyone goes calling BS, I've tried every other method to make them work - it WILL NOT WORK WITHOUT LOAD RESISTORS.

Don't the bulbs come with those already installed?

 

[AK49BWL]

Don't the bulbs come with those already installed?

Not that I've ever seen. They take up too much space due to needing heat sinks. Basically you're replacing the blinker filament with a big resistor - it needs to be able to simulate the load of a bulb so it heats up like one as well.

also...

LEDs are polarity sensitive. Have you tried re-installing them 1/2 in the socket?

They're 1157, there's only one way they'll even fit in the sockets. The only way polarity can be wrong is if the bulb itself was wired incorrectly during manufacture.

 

[Nad_Yvalhosert]

The 194 side markers need to be an incandescent bulb. LED"s are polarity sensitive. The blue wire is turn signal, the brown is parking lights.

With the lights off, the 194 blinks with the turn signal (blue is 12V power, 12V negative goes through brown wire, across another bulb).

With the lights on, it blinks opposite of the turn signal (brown 12V power and blue 12V power cancel out the light)

Again, 194 side markers need to be the incandescent style. Bidirectional. LED's arent.

Next, to fix the turn signal hyperflash get a LED flasher. It's cheaper than purchasing, cutting the OE wires to install, 4 LED load resisters. EP 29 if I remember right. I'll double check and do an edit.

Edit: 2 pin round flasher EF32

Lighting Turn Signal Hazard LED Flasher Relay 2-PIN No Fast Hyper-flash EF32 | eBay

Application: Hazard / Turn Signal. -Multi-purpose relay. -Compatible: LED Bulbs/Halogen Bulbs/Incandescent Bulbs. -For Both LED and Halogen Blinker Light Bulb Lamp. KK.FF.633 1.08 oz 2 oz.

www.ebay.com