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I think the AO trucks have the Polarity Protection Device (OP shows), though not an LBCD. Not sure that is an A0 schematic @Ronmar would know—

We are saying the essentially the same thing, except notice that only one connection is at P2, the rest are to P188. It would be nice to see the P2 pinout—

These pages show the CAT installed side (¿connector P1?) all in one place, the OEM side is liberally distributed about the other pages. It would be nice to find a pinout of the other connector, (¿P2 connector?). I still think the OEM tach was always run off the ring gear. Though the VDO...

Cat ECM pinout does show the tachometer feed on the OEM side, though I have yet to find it in the schematics. It does read in the J1939 feed to diagnostics. I keep wondering if it is in the connector under the windshield 'behind' the heater in all units, like in A0 units; and running off the...

Good thoughts— https://www.ceniehoff.com/Documents/Ctrl_Hyperlink/TG14_uid252021119472.pdf

We received a 24v 200a alternator and if I wasn't so busy working the dual voltage one would be out and bracket mods begun. I am wondering if the alternator shaft sizes will match, though am expecting I'll need another serpentine belt pulley for the new alternator before we can complete the...

REVISED Schematic concept 1.3 UPDATED in POST 82 Corrected (hopefully) wiring for 1– existing manual disconnect next to battery box; 2– deleted LBCD controlled remote disconnect next to battery box. Still working on best connections for a– wire 1471 (TL507) wire from 24vbattery side of LBCD...

I am far, far from an expert and know a little bit beyond nothing on these vehicles, though years ago with our caterpillar tractors I would have said. "Okay, we are good," with the readings in your video. I find as I wiggle the tester's lead on bolt heads, or try to ground on some...

As installed on our A1 with the Niehoff 100a dual alternator–

Unfortunately, so far I have yet to find a 24v heat pump for the habitat that I would install. That is likely pushing us toward adding a large DC to AC inverter /charger (Victron Quattro or Multiplus) to run a 110vac or 220vac LG or similar to heat and cool the habitat. We have have these...

That's just what we have on our A1–

Continuing to think about this system. With two separate 24v 100ah battery banks connected through a combiner is there any need for the LBCD or existing autodisconnect next to the battery box? A 28v 200a (5,600watts) alternator, provide 12v at PDP X3 with Victron 24/12 70a DC to DC converter...

Thank you. I understand your comments and they are well thought out. What brand 24v unit did you install in your habitat? I have thought a lot about the defrost. Recently tested it during our low teens cold snap with my wet dog riding shotgun. I learned that these trucks need to warm up...

Okay. Now I am feeling like I am working a 'flux capacitor' obviously I don't know the electrical as well as I wish. Reroute the manual disconnect before X1 leaving the batteries, alternator and starter all direct wired to each other. The LBCD is gone, so nothing to activate the auto...

Thank you. With leaving the existing disconnects in I didn't think about moving them to the ground side. I am going to have to go back to the LBCD schematic. I recall folks are cutting out the LBCD disconnect function, connecting 12v and 24v loads to 12v and 24v bats, respectively, I assumed...

Right. And you have a mechanical AC compressor so how much DC load do you really have?

I have read a lot of your thread and obviously need to do more. Thank you—

Looking at the way we hope to use our M1078A1, an middle aged couple traveling with a dog or two in a land yacht, we hope to have a robust cab and chassis electrical and HVAC system separate from a habitat system. For many years we have camped and backpacked at more remote corners of the...

Your description is all so confusing, no idea where to start. Photos of primer delete; which FASS pump did you install and why; photos of the alternator tag and which terminal is 12v and 3v; what did you notice above 14?

If I understand the design the brackets' horizontal surfaces never meet. The 'spacer' between the habitat's bottom rails and chassis' top rails keeps them apart—