While working on my fuel gauge, I have discovered that there is a fairly resistance (around 2 k ohms) between the ground wire and the frame. Given that the fuel gauge reads changes in resistance, this may be the source of my problems. Tracing this further, I found that this was true for all the ground wires serving the dash gauges and also the ground to the regulator and the overdrive relay. In contrast, my ohm meter shows very low resistance among all these grounding wires as I believe should be the case. The circuit diagram shows that the ground wire for the gauges, the regulator and the overdrive relay all share a common grounding point to the frame. My guess is that this is the source of the resistance. The problem is that I can't locate where this grounding point is. The ground wires disappear into the wire loom and I can't find where they join and connect to the frame. It would seem likely that this should be on the firewall, but I can't find any black wires tied to it. It could be under the dash, but before I try looking there, I'd like to know where to look. Of course, I could just tie each of the black wires to a new ground, but if possible I'd like to do it right.
Bruce Tomblin
Bruce Tomblin