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Yes on the earlier A1, it has a temp sensor to limit it above a certain temp. Not sure where it is located on the 3126. On my A0 it was a coolant sensor and opened the circuit above about 35F. Have seen conflicting temp ratings for the switch. If it is going clunk when you cycle the switch...

Yes and the power solenoid is right at the back end of the head…

I think on the early A1 it is not automated. I don’t think they did that until they started integrating both the intake heater and the ether. looking at the A1 drawing, the intake heater is controlled by the ECU, but the ether is still controlled manually. Does your truck have both intake...

Here is mine at 27F a few years ago:)

Oh wow, no I was thinking 30 min, 45 min, maybe an hour… I wouldn't leave it on all night, The block heater will not help with warmup, only startup. on the 3116 They diverted the bypass coolant from its normal Path back thru the engine where it can warm steadily to op temp, and sent it all...

Yea, What Awesomeness said. out in the cold, I figure the losses will equal the input after 30-45 minutes… would be pleasantly surprised to find it works with less, just havn’t had a chance to try mine yet…

On the 3116 The press and release the throttle, then hold at 1/3 is for all starts, not just cold ones, but I don’t think I have ever started mine this way. Thats how I start my tractor though… From 32F down to -25F, you press the starter button then press the ether button for 3 seconds on, 2...

I think on the C7, how they are used/applied is ultimately decided by the ECU…

Block heater, 1500W… Zero start 3500081…