I have some LED switchbacks installed in my front turn signals on my 2008 Silverado. I am also getting hyper flash.

So, I've attempted to install some 50W 6ohm resistors but I cannot get them to work. With the Silverado wiring at the turn signals, it's confusing since there are multiple wires going to each socket. One socket has two grounds, the constant power wire and the turn signal power wire for a total of 4. The other socket has two of each (two ground, two constant power and two turn signal power wires) for 6 total. I've tried every combination of turn signal power/ground but have not have any success. Not sure why GM couldn't make it easy with just three wires.

Has anybody here installed resistors on the front with LEDs? If so, can you send pictures or confirm exactly which wires you connected each resistor to? I've scoured the internet and searches with not much luck. Everything I've found basically says connect one to the black and the other to the blue w/ white stripe and you'll be good. Unfortunately that hasn't been my case and I'm currently stuck. I can't even feel them getting warm. So either I haven't connected them correctly or the resistor is bad. They are GTR Lighting resistors so they are supposedly supposed to be good quality and not some cheap Amazon ones.

I've even asked this question on some other GM dedicated forums but have not gotten anywhere there either.

Edit - I just checked and confirmed that both resistors are working and show 6 ohms.

 

why not just put them on each wire combo until it works? there are only 4 combinations.

 

That's what I've tried. I've done every combination I can think of and I believe there are more than 4 combinations.

There are two grounds and two turn signal power wires on one socket and two grounds and one turn signal wire on the other. I find it hard to believe that nobody has wired resistors on the front turn signals on a GMT-900 Silverado before than can confirm exactly which wires they used. I can find plenty on wiring for a Sierra but the wiring is different between the Silverado and Sierra. The Sierra is easier since there are less wires to each bulb.

 

There are 6. I misread your post and saw 3 wires for some reason.


I'm too lazy to watch the video but does this help? It's a Tahoe

 

Sort of. The wiring between the SUVs is different from trucks as well. The thing he did mention was that he did not ground the other wire from the resistor to a ground wire. He grounded that to the body and said it worked.

Is that possible to do? Everything I've read says you have to use a ground wire. I'm going to try the combinations again thinking I maybe didn't try one and see if I can get it figured out. This is a rough drawing of the wiring.


I think it would have been easy if they had a turn signal and ground wire from the harness to the top bulb to jump and then a ground and turn signal from the top bulb to the bottom to jump and be done. With so many wires running between the main plug and the bulbs, it's confusing.

Also, I can do basic wiring and testing but I'm overly cautious when it comes to electrical so I turn the power off every time I connect/disconnect wires. Can I leave the power on and the turn signal going and switch around the resistor wires without fear of hurting anything or getting a shock?

 

I mean best practice is really disconnect the battery but I leave the power on when I am doing **** like this. You would never get shocked real bad. This is only a 12 volt system.




I think that's how that works anyways

 

I've been leaving the battery connected but the key complete off when I change the wires around. Then I turn the key power on and turn on the blinker to test. If I can leave the key in the on position and the blinker running to move wires around and test, that would help make it go a little faster.

 

Yeah you'd be fine with leaving the key on imo

Everywhere I read about this it says black wire and then blue with white stripe wire you tap in to.
Are you sure you aren't mixing up the wires between the top and bottom bulb?

 

That's where it's throwing me off and not sure if I'm doing the right combination.

On the top bulb, there is a ground coming straight from the plug but no blue/white wire. There is a blue/white wire going to the top bulb but it's coming from the bottom bulb. It's the opposite on the bottom bulb. There is a blue/white wire going to the bottom bulb coming straight from the main plug. There is no ground. The ground is coming from the top bulb only.

 

Been playing around with the resistors and found out something interesting.

First off, I can connect one wire of each resistor to each blue/white wire and any ground and they get hot but I'm still getting hyper flash. The odd thing is, is that when either the fog lights or headlights are on, I get no hyper flash. As soon as I turn off the head lights, they start hyper flashing.

Any idea why they would only hyper flash with the headlights off? The headlights are LED S-V.4.