72 or 73 240z Japanese / Euro Tail light wiring

[brianZortiz]

Hi All,

 

I am close to finishing up my 72 240z and doing finishing touches, the last being JDM/Euro spec amber tail lights. Since the car is not going to use many functions going to the rear of the car I decided to wire it myself just for tail lights, rear side markers, and license plate light. The issue I am running into is how to wire a 72 or 73 4 pin 2.8mm spade connector tail light sub harness? A lot of the information online seems to be for early z cars with a 4 pin 6.3mm spade that has 3 wires on each of the upper bulbs. I know that I need to run an independent wire from the brake switch output wire that goes into the turn signal switch. The wire is Green / Yellow; all good there, but not sure how to modify the tail light sub harness.

 

A post on ClassicZ by Arne: https://www.classiczcars.com/forums/topic/32228-modify-us-240z-rear-turn-signal-wiring-jdm-style/ is helpful, but the first reply from OniZ mentions to make the lights work I need the early 240z 3 wire bulb socket on the inner upper bulb... Is that correct? Picture attached is my 72 240z sub harness and as you can see the inner upper bulb is 2 wires only. 

 

I know Green / White is running lights, but not sure if it's brake light too. Also, Green wire on the sub harness is Green / Red or Green / Black on the main harness which are the turn signals, but also not sure if they are brake lights also. 

 

Can anyone help? Do I need 3 wire upper inner bulb or can I make my current sub harness work? 

 

Looks like I need to snip G from upper right bulb so only 1 wire goes to turn signal for Amber which is bottom right, but not sure about anything else. Goal is to have running lights and brake lights for 2 upper bulbs and just turn signal light on bottom right.

[brianZortiz]

Oh, I think I figured it out. I do need a 3 wire bulb on the inner upper bulb to make the top two lights as brake lights. Per my first picture the 3rd wire on inner upper  would be G which is shared with outer upper and outer lower, this is how early 240z's are. I need to snip top two G wires and run that to the brake output wire which I changed to GY on the picture which is Green / Yellow the color of brake switch output wire. Should look like this to make it work: