Need some help with AC compressor voltage on my 92 xjs. The compressor would not kick on. test light showed voltage when key on. I thought it was the clutch until I put 12v direct to the clutch and it engaged. When I checked the voltage at the harness I found about 8 1/2 v on the hot side but also about 2v at ground. Any idea where to lokk for the voltage bleed on the ground? Thanks