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Exactly!

I am thinking you should see a check light briefly opon powerup. It Not being there is probably not a good thing...

Yep, and most of those large rotary switches use a cam or ramp to actuate a large bussbar and push it against the contacts. If I read your initial post, you thought it was off and rotated it to on, when in actuality it was on and you rotated it to off. What I think may have happened is that...

Now what you experienced may have been a latent switch, IE, the switch didn’t fully open and you got power thru it until you tried to pull any significant current…

Yea the early,A1s didn‘t have them. That remote disconnect is what the LBCD would use to disconnect the batts. So if you don‘t have that, as general said, you probably have a polarity protection device. You have the circuit board power panel and the 3126? I call these an A0.5:)

The caps are there to catch the voltage spike caused when the LBCD disconnects the batteries(load) from the alternator at full output… in my experience this is usually considered a big no-no, as that spike can fry components until the regulator can get it under control, but some bright light...

All the versions have them in the primary fuel filter/separator bowl. like the heater in the bottom of the air dryers, they come on with ignition power, but they are internally thermally regulated and do not actually provide any heat until they get cold enough. I think I read a spec on the old...

Or it wasn't cold enough to activate it when you were looking, or they called it something else… from the A1R manual.

Cold mode info: https://www.blog-teknisi.com/2020/02/cold-mode-and-no-engine-speed-on-status.html

I do not think so, i think CTIS gets speed info from the ECU in the later trucks so it can compare it to pressure and a look-up table to generate a overspeed and inflation response to deal with driving under-inflated tires too fast… I do not think it exports any data unless it is accessed by...

There is only one sensor for pressure in CTIS, on the Pressure control unit. When it seals and pressurizes the system to open the wheel valves, all tires are plumbed together and they equalize at the same pressure. That is the combined/average pressure that CTIS reads…

21-12 TPS filed low might indicate an open circuit. there are two connectors on the trans controller, A and B. Depending on wether you are a wtec 2 or 3 the controller is with the keypad in the dash and it uses a Vehicle Interface Module full of relays under the passenger dash. Or on the...

On the A0 trucks(with the TPS) there is nothing to interface with as they are all mechanical. That TPS IS the cat interface:) The trans controller is its own entity working with sensors and solenoids on the transmission. you will need to check wiring into the trans controller to make sure...

I have heard of people finding those. Would kind of tend to interfere with the deflate cycle on that tire I think:)

It should upshift if a peak RPM is exceeded. But that peak RPM set point may be greater than your current maximum governed RPM. Without TPS, the trans control does not know your desire to accelerate. You will need an ohmmeter to check its resistance and see that it varies with throttle...

What @TomTime said. I would add that if you have the old style fan clutch like seen in my video, there is no rebuild kit available for it and you will have to upgrade to the new style clutch. Unfortunately you will also have to replace the fan as the new clutch does not interface with the old...

Well when you turn on the switch an accurate instrunment with 0 pressure applied should indeed read 0… That warm pressure sounds a little high. You could hook up a mechanical gauge to confirm its readings. They put a manifold on these trucks where the switch and gauge sender attach, so it is...

That would be my recommendation, as well as pulling the dash and confirming the connections to the back of the gauge as the sense sig goes thru a plug to get to screw terminals on the gauge itself. if it is a 2 wire sensor, you also need to confirm one of the wires indeed goes to ground, and...

On the wheel valves, the air from the truck is fed into a port off to the side of center so fills in that area of most of the inner/inside face of the diaphragm. The outer face of the diaphragm is vented to the atmosphere, and there is a small spring in the center. Anything above 5PSI is...

Ctis closes control to seal the system, then gives a shot of supply to pressurize the system. The dumps are remote pressure regulators, whatever they see on the input they match on their output by passing input to output or venting output down to match input. When output is greater and while...