If you are talking about the old original IVR unit, they pulse like a flasher and it may "confuse" your meter. You will never read anything "that makes sense" from one of those
Typical problems: (in no order.........)
1....Add a pigtail from the cluster common ground point and bolt that to the dash frame/ column support
2....Obviously the IVR could be toast
3....The contact fingers for the IVR often don't make good contact with the board traces. Clean and solder jumpers across from contact fingers to board traces
4....Gauge nuts often come loose/ corroded. To "scrub" the board clean loosen/ tighten the nuts a few times
5....The harness PC board pins are crimped and corrode or come loose. Clean, solder, repair, etc
6...."Jig" it up and test "end to end" with test resistors for the senders and 12V to the appropriate harness pin on the board
Gauge test resistances
View attachment 1715967300
