Blinker wiring question

[kyngfish]

Took my front bumper off and bought some 3 pin connectors from amazon to splice into the blinker wiring so I don’t have to remove the entire housing when I take the bumper off. So I wire it all together. The connectors come with a red - black - and blue wiring. I connect the red wire to the red striped wire in my car. Black to the black with white stripe and the blue wire I connect to my brown wire. Both sides. Double and triple check. Plug it all up and test the lights. Nada. Run a multimeter to the side of the 3 pin connector coming from the car and sure enough I’m getting ~12 volts DC.

So if the wire from the connectors are matching up - what could be the issue here? Would this cause some kind or problem with the relay? Can a three pin connector only be wired one way? Not sure why that would matter. But I’m at a loss.

[kyngfish]

Nevermind. They just turned on. I don’t get it. Did the wires need to warm up?

[Tremelune]

911 taillight and blinker housings and their wiring is a curse. The grounds are bad often, and in such a way that makes them very hard to debug. From what I've found, 12v and ground points change based on whether the lights are on, the blinker is on, or some combination of the two. It's likely that the corrosion or something goofy with my housings is to blame, but I've never had a 911 that was straightforward with regard to blinkers and taillights behaving predictably.

Clean grounds, bend contacts, check for cracked plastic...