Originally Posted by country4x4
for the regulator, if I knew the specific voltage and ohms required, I could VERY probably pick up something at radioshack for far less. I suspect this to be the problem, but I'm gonna do some tests to confirm before I go throwing money and parts at it.
I dont doubt that I overlooked an obvious fault. but I have no idea.
The IVR is not just a simple resistor. Inside there is a bi-metallic switch like an old style thermostat. It pulses on and off every half a second resulting in a measured average output of about 5VDC. The 'duty cycle' output varies depending on the load. The load changes depending on the resistance of the 3 senders attached.
Here is a diagram showing the internals of the IRV. Notice the resistance wire feeding the IRV has some voltage drop.
Check the voltage there at that wire. Should be maybe 10 or 11 volts. If not you may have other issues such as a bad wiring, ignition switch etc.
One guy on another forum attempted to make one using a 3 terminal voltage regulator. I am not sure if he was successful? The thread went off in all directions... there is some photos of the insides of the IVR etc.