65 Valiant now gauges go full when ignition key turned or running
There's a number of possibilities. I would pull the cluster and get it working "bench tested" before reinstalling. Some of these comments are "in general" not specific to your cluster
1....IVR may not be grounded. They all have three electrical terminals, 12V in, ground, and gauge power out. Make certain this is so.
2....Original 3 terminal fuel gauge may still have the original IVR making connection, "screwing up the works." Have you seen the surgery indicated by some sites, including RTE?
RTE Limiter Faq - rte
3...the gauges may have suffered damage from the old IVR not working correctly
You need to review some of the threads on here regarding testing. Get some method of test resistors. Either a big wirewound pot, or a tank sender, or at least three test resistors. you can "set" the pot/ sender for the proper test resistances, or substitute individual resistors to obtain empty / mid / full readings on all three gauges
Here:
Hey Del, Look what I found!!! An original Miller Gauge tester!!!
This is right off the back of the Mopar test unit in the shop manual, the yellow values have been edited in. I did not make this photo
There's a number of possibilities. I would pull the cluster and get it working "bench tested" before reinstalling. Some of these comments are "in general" not specific to your cluster
1....IVR may not be grounded. They all have three electrical terminals, 12V in, ground, and gauge power out. Make certain this is so.
2....Original 3 terminal fuel gauge may still have the original IVR making connection, "screwing up the works." Have you seen the surgery indicated by some sites, including RTE?
RTE Limiter Faq - rte
3...the gauges may have suffered damage from the old IVR not working correctly
You need to review some of the threads on here regarding testing. Get some method of test resistors. Either a big wirewound pot, or a tank sender, or at least three test resistors. you can "set" the pot/ sender for the proper test resistances, or substitute individual resistors to obtain empty / mid / full readings on all three gauges
Here:
Hey Del, Look what I found!!! An original Miller Gauge tester!!!
This is right off the back of the Mopar test unit in the shop manual, the yellow values have been edited in. I did not make this photo