'91 Lumina inj.?

I disconnect all inj. and have power one side & grnd. on other side of circuit. If I connect to just one inj. (doesn't matter which) I lose the grnd. & show power on both sides of cir. (both done with key in run pos.). Same happens with key in start pos.

I disconnect all inj. and have power one side & grnd. on other side of circuit. If I connect to just one inj. (doesn't matter which) I lose the grnd. & show power on both sides of cir. (both done with key in run pos.). Same happens with key in start pos.

remember injectors are grounded by the pcm/ecm so make sure the computer grounds are good . do not screw with grounds with power to computer or you can damage it......

All changes of connections done w/key off. Can't figure why have no grnd. w/system connected. Test light does not flash when cranking with wires connected.