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Same place as on the A0:). Inside the reservoir…

Well either something is loose and leaking air, or the pump has issues. Does the sound change when you turn tge wheel/use power steering? I would probably take the pump off and run it without that and see what it sounds like, although a mechanics stethescope should be able to tell you exactly...

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

If it hasn’t set that low for too long, the battery may be recoverable, charge it. If I am recalling correctly the A1/A1R shouldn’t have a 12V vampire. The Vampire on the A0 is I believe from the 12V feed to the Vehicle Interface Module, and the WTEC3 transmissions don’t use that or 12V as far...

Ok what exactly do you switch or jumper to start the truck? By cab battery disconnect are you referring to the red guarded sw to the left of the steering column? That sw does 2 things. 1. it opens the battery disconnect relays in the box to the rear of the batteries adjacent to the manual...

Well yess there is, with a ohm meter. But that code 66 indicates the TCU isn't even looking for it. The code 66 says it is looking for TPS data from the engine computer which you don't have on the 3116. Like I suggested to Superman if it was looking for the standalone TPS and it had an issue...

TPS = Throttle Position Sensor. On the 3116 it is on the drivers side of The cylinder head above the primary fuel filter.

Well if it is in the mode of looking for a standalone TPS I would suspect it would give some form of TPS fault like a 21-12 or 21-23 for failed low or high as it would report a TPS voltage outside the idle and full throttle positions stored in memeory…

Ok, then it sounds like a harness mismatch or issue telling the TCU that it is in a different environment…

Have you ever seen this truck operate correctly? With a 3116 engine and properly programmed wtec2 or 3, you should never see code 66. That indicates loss of serial comms to the Engine Control Unit(expecting to see throttle position data from engine computer), which this truck never had… code...

Yea i don’t see the need for center diff interaction control with what I am envisioning, as it is on a per axle basis(controller for each axle). I envision it more like an on demand electronic locking diff, and when you would use it the center diff is probably already locked in mode. It would...

The secret of traction control is in NOT braking the wheel to a stop, only applying enough additional drag to the slipping wheel with a brake so that the diff thinks it has two wheels with traction and sends more torque to the wheel that actually has some. I do this with my tractor on occasion...

I think they may, they appear to use the same reservoir/filter assembly, and the A0 24P shows P/N 7632 141 102, but part target crosses that back to the same NSN that General disorder listed above. Also crosses to a Fram CH803APL.

1/2” grade 80 chain is typically rated 40-48K breaking strength, depending on who is rating it. 2.5# per foot, so 30’ = 75#?

Yea, it’s called a chain…:) The problem with synthetics is once you stressed it to breaking point, you stressed every fiber in that line to the same point, so it probably will break a lot easier next time. Just like in climbing, once y9u fallinto a line or a harness, it gets decommissioned…...

I like the properties of rockwool if you are wanting batt insulation…

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...

The buzzer is probably the low air alarm right in front of the steering column. Remove the cover to the power panel. You have 3 test points on the left. What voltage do you see at the 12 and 24v test points measured to the ground test point? What does the voltage at the test points do...

A bad 15PSI oil pressure switch circuit on an A0/A1 will cause a failure to crank, not a failure to run…

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...