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Would someone please describe the architecture of the grid heater system and why two solenoids are required. A previous series of posts described how to change the two solenoids, but it did not describe the control circuit or the logic sequence.

I believe they are not remaining energized because the volt meter does not pull down as it does while the WAIT TO START light is on. Also there is more smoke, and the engine seems to stumble during warm up idle than previously.

The outside temperatures are 25-30F.

On my '96 truck, the grid heaters no longer cycle after start uip. During the "WAIT TO START" time I observe the voltage drop. But after start it no longer cycles as it did in prior cold weather. What is defective, and how do I fix it so the heaters continue to cycle while idling cold?

Is it not true that the professional estimates were done by analyzing the chemistry of the additives in each sample? If so, there is no inclusion of any wear tests or thermal degradation tests. Wouldn't we want to see a complete spectrum of tests in order to have a better estimate of how an...

Bending the float arm seems the best solution to match the gage with the gallons in the tank.