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The alternators are extremely robust and counter to forum lore here, they rarely fail. The regulators are perhaps slightly more delicate, but most all assumed “failed” alternators ultimately appear to go back to really poorly maintained wiring, battery problems, and ultimately, poor...

13’ 11’ as measured at full tire pressure.

+1 for multiples!

Would you mind sharing some details on how you are applying the brakes on the towed vehicle?

That terminal only gives you alternator shaft speed not engine speed, I suppose if you knew all the diameters of the pulleys you could do math to get the engine speed. The output of the AC terminal is Hz X 10 = Shaft RPM

That’s pretty sweet! Are you still able to use the radio for voice communications as well?

How are you sending commands? Keying up the mic?

The DPA 3 is really the key to the whole thing, you gotta have a good data bus adapter to talk to all the computers that the A1 and up trucks have. All the other analog tools in the kit, could theoretically be fabricated yourself, but if you don’t have them already, why bother. For example the...

Also to power the interconnection box, which is what all the analog test pieces hook to, you will need this cable to get 24 volts from the slave port on the truck. You’ll need this to power up the hydraulic pressure sensor needed for the test #51 mentioned in the TM above. Normally that box is...

Yeah that hurts, but not much on these trucks is cheap unfortunately. First time you program your CTIS or CAT ECM on your own you'll feel pretty good about yourself. I think @GeneralDisorder can even make you up a nice diag laptop with all the software preloaded if you aren't a techie.

Fake News, software is available see @GeneralDisorder statement above. In my personal opinion this is the better kit because all the implements are wired. I have this one and a newer Spiral Two and this is the one I go to.

You absolutely need one of these for an A1, the DPA3 lets you interface with all the computerized systems on the truck. Software is available if you ask on the forum nicely. As far as the price goes, sometimes sellers will offer a lower price if you have it on your watch list. Also there is...

You could buy a STE/ICE kit so you can perform the hydraulic tests required by the TM…..? https://www.ebay.com/itm/326079778718

This post filtering (and the restriction that creates) is known to have absolutely no effect on the HEUI system? Is there any CAT documentation about this modification?

This is an awesome write up! Very thourough. One question though. In the beginning of the post you mention that you had a bad gasket, but later you mention that there were no signs of gasket failure or leakage between the filtered and unfiltered sections. Why do you say the gasket is bad...

Might be more work than you want to do but the pins are present in the controller, and if you already have a J1708 port for the transmission, might make sense to just run the CTIS 1708 over there so you have access to both controllers. The DDT is just the right tool for the job on CTIS. It works...

It would be the proper course of action to simply ask the controller you have what is wrong with the system, and then repair from there. Dana Diagnostic Tool and a J1939 adaptor is what’s required for this.

Nice Catch and write up!!

On my M1082, that is used for releasing the brakes when the trailer is not hooked up to the truck, and it works on mine.

Wow 4 trumpets! Those look insane! They must stick through the grill in that forward facing configuration?