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What General said punch in the middle of the screw head and tap with a hammer to break up the white powdered oxide between aluminum case and steel threads. Have the same issue with old motorcycle case screws and shocking them has proven very effective over the years. Shocking/tapping while...

Bad voltages and grounds cause issues, but it sounds like one of those units is programmed for a different pulse per mile than your vehicle delivers. I think Superman can reprogram them

You will need a double pole sw, but yes just like the drawing shows should work fine...

I believe that is correct yes. You can access the wiring and wire in the switch. Like in tge drawing pic I posted, One half powers the CTIS controller while the other half powers that OFF light when you turn CTIS off. Most of the wiring should be in the main truck harness as it connects to...

The drawing I am looking at says there is a CTIS off light(DS29). I only thought there was a ctis overspeed light, and on the A0 thats all there is. But apparently they were added in there at some point. @Wingnut13 that other harness is probably your issue. No telling what they assigned the...

Well thats exactly what they did on the A1, a CTIS power switch. Depending on your vehicle, pin H may or may not be the power. I think they used power applied to various pins or combinations of pins from the sub harness to configure the CTIS controller for different applications. Different...

What Geopen said... i have lost count of how many I have run across with 5 solid/failed controllers...

Yep, been doing this for years now. The issue with a regulator can be flow. If you limit pressure differential you are going to significantly lengthen fill times. And as I mentioned a pressure switch needs a little delay to prevent triggering during normal fill cycles...

No the complexity isn’t really the issue, it is just that it is some work and another project for a feature I might only use a few times a year…

No real difference having it go to 85 vis 75. I don’t see a reason to sneak up on it, so why not have it go all the way? That bit is easy, using the wet tank switch to control the fill cycles, and measure the pressure switch between fill cycles during stable tire pressure.. The safety cutoffs...

Yes except you need to put a little bit of delay into the resonse. When you command a fill with full tanks, the PCU pressure momentarilly exceeds what I would call a max allowable tire pressure alarm point(spikes over 100PSI). The periods where the PCU exceeds where I would like my alarm set...

I think the pressure increase with overspeed is mentioned in the A0 op manual. Yea fixed switches on a manual control is not a good idea. These vehicles ride on some very large air filled bombs. I have always reccomended and demonstrated momentary switches for controlling supply. You would...

You really should ask a fresh question. The people who could maybe answer it might never see it in a CTIS discussion…

Where were those voltages measured at? If at the batteries, thats not bad, but I would also compare with voltages directly at the alternator terminals. That is where the regulator regulates the voltage to. They put a lot of connections on these trucks When they incorporated the polarity...

There are 2 neg leads attached to the battery. One goes to the nato port, the other goes to the starter negative. It is the one that goes toward the starter that you want to interrupt. I don’t know the specs on that switch you showed. Whatever switch you choose it needs to be able to handle...

The simplest way is to add a high current switch on that ground lead. This will stop the truck from drawing any current(and kill that 12v vampire). It will NOT however remove the difference in potential between 12 and 24V, so you can still run into issues when working on the truck electrical...

What Mullaney said! I start with my ears, then my hands, then bubble mix. I would add check the glad-hands and normal vents(right under heater behind grill, bottom of relays and qr valve). Also don't forget the park and trailer plumbing in the dash. The seals on the push-pull control on the...

I got the impression that the inner 2 were the same(12.5) and the outer two were also the same(12.4). Being wired in parallel, that is not unexpected…

They may not be easy to kill, but they do appear to have a fairly high failure rate:) IRT your battery voltages, they are OK, but they also illustrate one of the biggest issues with the LMTV. Depending on the battery type those resting voltages indicate a range of 70-85% state of charge. You...

Yea the whole unit is potted horribly, no internal box access. I couldn’t remember if the keyboard had any access. I gutted my dead one to make my first manual controller prottype.