Ijdmtoy 4th brake light led (bulb new version)
 

2016 frs
Ok gifted the 4th brake light led (ijdmtoy) for Xmas
Have some issue

Wires
Red - stop / brake pressed.
Blue - brake light on
Black - ground

My brake harness *power probe tested *

Red - parking light| * | * |black - ground
————-
Blue - brake light | * | | yellow- turn signal


My issue is I connected them like stated above
Then Turn the power switch for parking lights . The 4th brake light is not illuminated. As soon as I remove the red wire out of the pin connector. It illuminates.

*When all 3 are connected and I hit the brake the brake lights up but still is not illuminated.

*when I connect the 3 wires to a battery it works properly


Any tips ? Photos / probably have a bad bulb idk help a brother out thanks

iJDM 4th brake light won't work out of the box, need a diode
 

Whew, finally got around installing my 4th brake light.

The wires are switched, as you mentioned, out of the iJDM box.

The sad thing is that they don't even know what they did wrong when they switched over to the newer grommet version.

What you need to do is add a diode that can handle over 12V and 1A. I used a 1N4004 diode, and tried a few other diodes that tended to work as well. Only one I couldn't get working was a 1N5817, which I think was supposed to work, maybe my diode was defective?

Also, keep note that diodes are directional. So, direct it where the power sources goes into the brake light (for the red wire) and connect it to the green wire (in the BRZ), blue wire on the light connects to the red wire in the harness, and black is with black. Again, iJDM doesn't really know what they're doing, so they switched the wire colors and got rid of a necessary diode for the brake light to work.