o2 sensors

i need to know where to hook up the rear o2 sensors on my 1996 suburban 5.7 liter. It has custom dual exhaust and no wiring runinng fron truck to hook up rear o2 sensors any answers?

what do u mean no wiring. this truck is wired for 4 o2 sensors. The rear ones come of the transmision/transfer case harness. Unless they cut them off when they installed your exhaust.

they must have been cut off cause their is no hook up. the truck runs good but the check engine light comes on cause those rear sensors are not in so i delete the code every couple of months but it would be nice to find out where they go i looked but can not see where they were cut. ??? any idea's or diagrams for this looked on mitchell but no wiring??