95 S-10 Truggy Build

[93 Krawler]

Ok, here's one that makes no sense to me. See if you guys can solve this.
On the s10, the factory harness is running to the back to run tail, turn, back up, fuel pump, and fuel level. I cut the ends so i could reconnect later. So my issue is just with the rear lighting. I have a yellow, green "both turn signals", brown "tail lights" light green "back ups", and a white "brake lights" which i assumed was ground. Nope... I still had the tail light harness and didn't see a white wire anywhere. Where did this white wire hookup to run the brake lights? Any ideas...

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