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Charge voltage dropping is a weird symptom, unless it is confusing the crap out of the MMDC... With 5 solids it is probably the CTIS box, or a power feed issue , in which case a new CTIS will have the same issues

"uh-uh... I know what you are thinking, did he fire 6 shots or only 5"... So, You feelin lucky?

did the reader function OK with CTIS connected? one potential issue we have seen here is the bad module pulls down/corrupts the data bus causing the other faults, and in some cases frying the bus end loading/termination resistors... 5 solids is usually a dead CTIS controller(failed internal...

And of course the other side of this coin is that it is really poor design/planning that puts two compatible connectors adjacent to each other that are NOT intended to ever connect to each other... At some point, some bright light is going to decide that those two should be mated...:) I call...

Also what RPM are you calling “Redline”… i doubt the engine is ever pushed over max governed RPM as the trans controller will not allow it… also of note is that the marine variants of these engines have a max governed RPM typically several hundred RPM higher than the road variants…

Here is the link…

Correct! if the lift line from tank to primer is intact, the primer should suck fuel from the tank in ~16 pumps., just like in the video. if not, the lift line, crimps or fittings are not sealing properly and is allowing air in instead of lifting fuel, or there is a leak on the tank supply...

Heat transfer is about temp difference, surface area and TIME. There are of course a few other factors that interact with and effect these big 3(transfer material, turbulence flow rate ect) . If the coolant is flowing unrestricted, it flows faster and has less time in contact with the heat...

But regardless of what you request, the trans is still going to decide how the shift is accomplished and when... The Allison is also continuously evaluating and learning/refining its shifts. if the shifts seem overly harsh, keep doing more of them so the transmission can educate itself... I...

That downshift select point is only a REQUEST, same as you pushing the down arrow button. The allison WILL NOT ALLOW an operation that will harm it. In fact if you are going down hill in a low gear and it winds up too high, it will automatically upshift to keep from exceeding RPM limits...

Interesting… It might be using a different set of shift criteria in mode, besides having a first gear available to shift down to, so it might be holding lockup(F solenoid) closer to the stop. Actually chasing an ex leak at my ex brake valve today:) will have to play with this in mode with the...

in the power panel, The 3 round terminals(1” in dia female threaded hole) on the left should be: top to botton X1, 24v, X2 12V and ground at the bottom… The PPD itself is probably fine, the cable terminals and the stacked connection are probably corroded not allowing any real current flow to...

What NDT said. under the power panel cover in the cab y0u will find 3 round power/test points on the left. 24v, 12v and ground. What do you measure between the 12 and 24 points and the ground point in the cab, and what do they measure when you turn on the ign switch? RULE 1: VOLTAGE IS NOT...

Yea what General said…. put some weight on and try it down hill:) empty truck on level ground will slow down and drop out of EB sooner…

no fuel at the primary probably means it is sucking air instead of fuel. 1. check the primer is pulling suction. disconnect the input fuel line at the primer, put your finger over the inlet fitting to the primer to seal it. push in on the primer it should stay in as long as you hold a seal on...

Yea the TCU will drop out of exhaust braking if it senses an impending stop, the same as it drops out of lockup. a member here posted a video showing his holding ex braking(and i am assuming TC lockup) down into 2nd, but I suspect he was decelerating VERY slowly for it to maintain that situation.

Not the first time I have heard that... the CB's seem a little janky anyway. i kept a few for troubleshooting as they are kinda handy when searching out an intermittent short, but replaced everything in the panel with standard auto blade fuses. Too bad you can't do that:( Glad you figured...

Look on the back of the switch itself. Like on a relay, the pins are typically numbered there...

Are the surfaces flat? I use a flat file to draw file mating surfaces flat(pull file perpendicular to the long axis of the file like a draw knife), to reduce any raised areas… For paper gaskets I have used a spray sealant called copper coat for decades when needed. Hang the gasket on a hook...

One is in the front of the transmission case, down on the passenger side(input speed code 2214)), the Turbine sensor code 2215 is in the valve module inside the transmission and that whole module must be dropped to access that sensor. The output speed sensor(code 2216) is in the transfer case...