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Another update: started checking over other suspect electrical components. Thought maybe the cold advance solenoid could be bad. Seems as if the switch is doing its job and supplying 24v when engine is cold according to my multimeter, also clear that the solenoid itself is getting power. I...

Update: Ohm out all plugs, they are within spec about 4-6.5 ohms was what I was constantly getting. Decided to get somewhat creative and ran a wire from the 24v negative battery post to the neg probe on my voltmeter. Then I struck the pos prob onto each glowplug lead and tested individually...

This is interesting. Not sure why I ended up with the wrong temp control for KDS and not the Nartron all this time. I just ordered the correct one though from Hummer parts guy so we will see if that does anything. Thanks for the info!

I didn't get around to it today but I will probably ohm out the plugs tomorrow just because its easy and might as well. Did the voltmeter on the batts with the wait light on and saw a slight drop, maybe less than half a volt. IDK if that is normal or indicative that not all glow plugs are...

I figured that may be the case with the new boxes. I just replaced all glow plugs thinking the same thing so that is probably not the issue. One thing I am thinking is maybe my batteries are just bad. Idk but seems logical the box would behave like normal but not have the power to warm the plugs...

Issue is as title says. I have the newer smart start box (nartron) paired with the yellow band temp sensor. Turn key, wait light on for 10-20 seconds, no amp draw shown on Guage, Humvee starts hard like it's got cold plugs... I also don't here clunking of relays anymore, but not sure if that's...