68 Barracuda........ Temp and Gas Gauge Issue.
There are bunches of old threads on gauges, clusters.
I would "rig" the cluster out of the car so you can test it. Be sure the studs/ nuts at the gauges are making good contact.
Use alligator clip leads from your fuel sender, or get some other resistors to use as sender substitutes.
Rig battery power to the proper harness connection and verify that it is transferred to the proper post on the fuel gauge
(Be aware a popular problem is broken / loose connector pins, IE not making contact with the traces)
Here's how the fuel gauge works. It has THREE terminals, unlike the oil / temp
1.....One terminal is 12V INto the gauge from the harness connector pin. This feeds power to the IVR unit
2.....Second terminal is common with the fuel gauge itself as well as the regulated power coming out of the IVR. This pin feeds the "5 v" to the other two gauges
3....Last terminal of course is the sender
There are numerous forum pages and sites on this
And this one is excellent
mopar rallye gauge voltage limiter - Google Search
RTE Limiter Faq - rte
A big discussion about the Chrysler gauge tester which is a simple box with three resistors
Hey Del, Look what I found!!! An original Miller Gauge tester!!!
In other words you can test all three gauges with three resistors, for empty, half, and full
A photo of part of the chart on one Mopar tester. The yellow resistor values were added by someone else. Those are what you need
There are bunches of old threads on gauges, clusters.
I would "rig" the cluster out of the car so you can test it. Be sure the studs/ nuts at the gauges are making good contact.
Use alligator clip leads from your fuel sender, or get some other resistors to use as sender substitutes.
Rig battery power to the proper harness connection and verify that it is transferred to the proper post on the fuel gauge
(Be aware a popular problem is broken / loose connector pins, IE not making contact with the traces)
Here's how the fuel gauge works. It has THREE terminals, unlike the oil / temp
1.....One terminal is 12V INto the gauge from the harness connector pin. This feeds power to the IVR unit
2.....Second terminal is common with the fuel gauge itself as well as the regulated power coming out of the IVR. This pin feeds the "5 v" to the other two gauges
3....Last terminal of course is the sender
There are numerous forum pages and sites on this
And this one is excellent
mopar rallye gauge voltage limiter - Google Search
RTE Limiter Faq - rte
A big discussion about the Chrysler gauge tester which is a simple box with three resistors
Hey Del, Look what I found!!! An original Miller Gauge tester!!!
In other words you can test all three gauges with three resistors, for empty, half, and full
A photo of part of the chart on one Mopar tester. The yellow resistor values were added by someone else. Those are what you need