Curious about this hyperflash business

1st post! and I did some searching on here before asking this so please go easy if I missed the obvious somewhere....

2015 Tundra Limited, maybe two years ago I upgraded the head lights and tail lights to LED options. The headlights I had upgraded to at the time were from AlphaRex. The blinker/running light for those headlights used the factory bulb (No hyperflash issue, even with LED tails). Long story short it was a garbage purchase and I finally updated to the option from Form Lights (https://www.formlights.com/2014-2021-toyota-tundra-led-projector-headlights-pair.html)

These headlights integrate the blinker into the DRL (no factory bulb). I installed them today, everything works fine except I have hyperflash. They advertise these as being plug n play ready, with no hyperflash. I have reached out to them for guidance but in the mean-time I've been wondering..if the headlights are fine in terms of built-in resistors, but the tail lights do not have resistors, could this be the cause of hyperflash? An issue Previously masked because the headlights I had prior still used the factory bulb?

Sounds kinda dumb but I'm not completely familiar with electrical stuffs. Thanks!

 

I think the problem is likely due to the led tails.
Something like this should fix your issue

https://shop.advanceautoparts.com/p...V58mUCR3lSArQEAQYAiABEgLij_D_BwE&gclsrc=aw.ds

 

Amazon sells you 4 for half the price of advance....

$9 Aaron 4Pcs 50W 6ohm Load Resistors - Fix LED Bulb Fast Hyper Flash Turn Signal Blink Error Code (Resistors get very hot during working)

https://www.amazon.com/gp/product/B00L4V9ECY?ie=UTF8

 

Careful with resistors, they build up intense heat. I would rather just change the rear blinker bulbs back to non-LED instead...

 

Thanks everyone. I realized I still have my factory tail lights in a box somewhere, so I think I'll dig them out and install one side to see if it changes anything. That should tell me for certain whether its an issue with the new headlight or the tails causing the hyperflash.

 

Alright tested it out with a factory tail light installed and confirmed it's the tail light causing the hyperflash, but I realized it's more like a semi-hyper flash. I also confirmed these aftermarket Tail lights DO have resistors (2 each side) that I installed inside the cavity behind the tail light, they plug into the harness from the light itself. It seems like the resistors from the tail lights, resistors from new headlights, and the blinker relay are not compatible with each other. I'm just unsure as to why.

- With factory tail light installed=blink operation normal
- With tail light completely unplugged = hyper flash (constant steady fast blink pattern)
- With LED tail light installed (resistors plugged in) = semi hyper flash (1 to 2 normal blinks, followed with 2-3 fast blinks, repeat)
- With LED tail light installed (resistors UNPLUGGED) = hyper flash (constant steady fast blink pattern)

 

It may be because you have 2 resistors per side. Can you remove one resistor?

 

I tried not plugging in one of them (tested both plugged in separately) and no dice. BUT, I narrowed it down even farther. From the back of the tail light, there are two separate plugs that come out and plug into one of the resistors each. When testing, I ended up reversing these connections from what they originally were, and it fixed it (sorta). I'm basically now at a point where the blinkers operate normally until the actual head lamps are on. Once they are on, the hyperflash occurs, but if just the parking lights or if in the off position, everything's happy.

That being said, I figured the resistors must be different Ohms each, otherwise it wouldn't of made a difference if I reversed it or not. I was able to test one of them because it sort of fell out of it's housing while I was messing around with it, so I could get to the exposed leads, and it tested at 10 Ohms (seems kinda high?). I have no clue what the other one is or would need to be, or why it only does this with headlights/tail lights all the way On, but NOT when parking lights are On.