If that shouldn't worl, you are going to have to cut the harness from the rear, splice in a new one & well you know the rest of the story.
1994 E500 (MY SUNDAY DRIVER)
1993 190E SPORTLINE LE W/ M104 SWAP
2000 BMW 528I (WIFEY'S CAR)
"Excuses are crutches for the unfounded."