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something else you might tell them, top speed is 52mph, not limited but maximum, dont know if that helps or hurts in this instance, I know in the real commercial word, if a driver is having issues getting insurance due to tickets, if his truck is speed limited, that helps.

$200'ish a year

good catch, attention to detail

Sounds like an governor actuator issue read and test the throttle controller with this manual. https://www.steelsoldiers.com/threads/mep-805b-806b-electric-fuel-cutoff-tm-troubleshooting-install-manual.145444/

I have state farm for AMi, m916 with a m970 tanker, they are registered at 70K lbs, my policy is commercial due to weight but cdl not required because they are both tagged as a standard private use tag, same as you have on a pickup and single axle trailer, I carry liability only, bodily injury...

there should not be smoke after the first 1-2 seconds of heat run time, it will puff a couple seconds, not more than 3-4 when cycling on/off or when moving from heat to vent. I vent my heater exhaust to the 'storage' side of my shop and have no issues with carbon monoxide in the big side, unless...

the burner is accessed from the heat outlet, in this thread, https://www.steelsoldiers.com/threads/h140-fuel-pump.212317/ post number 5, photo h140-3, it shows where the burner assy is mounted. here are the 2 manuals you will need. i like the parts books, they are good at showing exploded...

are you getting any burn when looking thru the inspection glass? if not, i would pull the burner assy, and disconnect the fuel line at the fuel pump and push K1 thru the line backwards with a syringe or something low pressure. Just bc you have psi on the gauge doesnt mean there is pressure to...

Another odd K8 relay quirk found this weekend..... so it got cold and attempted to start a heater, cycled to heat 1 time then beeper and red light turned on, no biggie, first time starting this season..... and now only light and beeper even after resetting, check everything else, still red...

this shows fuel pressure as heat (90psi), then fan(25), then purge(15), then fan and back to heat

are you checking and adjusting the pressure in the 'Fan' mode or 'Heat' mode? you will have 40 psi on fan mode only and about 20 psi with the purge switch engaged in fan mode, there will be no fuel to burner also in fan mode, only return fuel to the tank. to adjust high side pressure, it must...

now for the fun part, load testing to verify, sure is fun to blow the cobwebs out. the 005 in this video is still on an offgrid ranch in montana, with who knows how many hours. https://youtube.com/shorts/eYIebmttjZs

So along long time ago in a land far far away, I had an 805b that was the red headed step child, always throwing a fit, never working when needed. I ended up removing control coupla, removing backplane, all of the components from back plane, air blower cleaned, inspected sockets, pins...

so that thread is for you to learn mpu testing, adjustment, removal installation and provide a way and part numbers to get you a new one if needed. The OP never responded if it was fixed or not, you could ask the OP @GIJoeCzar if he got it running, that thread took from May to Sept to work thru...

here is a thread to read thru for the Magnetic Pickup Unit, MPU https://www.steelsoldiers.com/threads/mep-805b-no-power-to-the-adc100-electric-actuator.178809/

that is a 12v charger, 12.4v on 1 battery is acceptable, as long as both batteries are the same

Has the machine ever ran correctly? where did you get the machine? video of an attempted start? like @Guyfang said, magnetic pickup.

@Mk23 I did have a complete wiring diagram on mine and spent a good day chasing just to make sure I didnt miss anything before I started to replace the switch. The size was different so I had to replace some of the wires. While troubleshooting, I did find a rectifier that did not test...

this is the one that I replaced mine with, but I had information on the old magnetic sw to compare my new one to https://www.amazon.com/gp/product/B00EZ1Q9VE/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1

I wonder if we can reverse engineer the the 805 with a locking cable, and delete the speed control board.