I am hoping someone can point me in a direction to resolve an issue I am having with my Fuel and Temp gauges. I have been assembling my ‘67 GT Standard over the last 10 years and the car now runs and drives and is basically complete with the exception of three or four issues. Two of these issues are the Fuel and Temp gauges not working.
When I put the car together, I installed the new electronic IVR. Because the gauges were not working, I hooked up my gauge tester from Desert Classic Parts and it indicated the IVR was not working. I then tested the voltage coming into the IVR and it showed 12.4 volts with the key in the run or ACC mode. The voltage coming out of the IVR was 4.9 volts. That made sense to me. I also tested the voltage at the end of the wire coming from the IVR output terminal that feeds both the Fuel and Temp gauges. That showed 4.9 volts - which also made sense to me. However, when I connect the wire from the IVR output post to the posts on the gauges and then test the voltage on the exposed portion of the gauge posts it shows -0- volts. Similarly, if I connect the gauges to the IVR output wire and then test the voltage at the IVR output terminal - it also shows -0-. But, if I disconnect the IVR output wires on the gauges - the voltage on the IVR output terminal returns to 12.4 volts. I do not know enough to be sure if this is a problem or even how to rectify it if it is a problem.
I happen to have an extra new electronic IVR - so I switched the IVR’s - same result. On the off chance my gauge tester was not working properly, I tested it on my ‘69 XR7 and it worked as it should. I also confirmed I was connecting the IVR output post to the correct gauge posts. Although it is entirely possible I have done something else stupid.
While I can - and I am - driving the car, I would really feel more comfortable if I could get the Fuel and Temp gauges working. If anybody has any suggestions as to where to look next, I would really appreciate any ideas.
Thanks.