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Just so you are aware, the 31s are not exactly plug and play, fitting them into the box without removing the base plate is a little tricky, but a pair will fit if placed carefully.

I just broke down the reasoning for the battery bank sizing in this discussion post #11 https://www.steelsoldiers.com/threads/new-ride.212333/

When you have the ECU scanned to identify that CEL fault, see if they can also copy the engine personality files. The ECUs they used in these 3126s have been known to have their internal keep alive battery fail. When this happens the ECU is bricked and must be replaced. You will want a copy...

At ~225AH, the 8Ds are only a slightly smaller bank than the 240AH that the four 6T batts create. still way too much for the dual volt alt to support properly. Around 100AH is a much better match for the alternator, So a pair of the 6Ts(120AH, NOT AGM), a pair of 31’s at 100AH, a pair of group...

Yea the installed wiring between batt and alt is only good for about 200A.

Yea the manual is full of errors/omissions. I forget which port/sender is which. I removed my senders and installed a dual needle mechanical and standalone low pressure switches when I did my dash makeover so I have no way to check more easily than you can… The simple way to check is to drain...

Well first off the A0 has a 12v vampire load. Which unless disconnected, run regularly or a maintenance charger and balancer installed, will draw down those batts just setting there. A wet cell wants about 25% of the batteries AH capacity in amps out of the charging source during the...

They should never be pegged at any point. All the gauges are 24v but use 12v lights...

Yes auto blade fuses will plug right in. I swapped all mine, and kept one of each size CB as they are handy for troubleshooting. Is this an A0? The A0 uses a mix of 12 and 24v relays with 4 or 5 pins. They fixed this on the A1 which only uses 12v relays. Only buy 5 pin replacements. They...

I do the same thing with an Ipad. I cropped just the schematics out of one of the manual PDFs it is a smaller file size so loads and pages faster than an entire manual. well if yours is stuck on, either K2 is stuck or something is powering it like a stuck ignition switch. Pulling CB70 will...

You are right the gauge should not jump around and should read sensed pressure as soon as power is applied. The gauge sensors are dual function. They have 3 connections, 2 terminals that complete circuits to the sensor case, which must have a good connection to ground. One terminal is a low...

”This master switch issue has cropped up” what exactly does that mean? In The OPs post, his wouldn't shut off, I am getting the impression that yours won’t turn on? The A0 uses 12v batt power thru Circuit Breaker 70 and the ignition switch to energize K2. K2 provides 24V ignition power to a...

Better still, charge them get them load tested and only re-install the best two:)

As General alluded to, the rear regulator terminal on that alt/reg is a sensor output. On the A0 trucks this wire simply goes to the STE connector under drivers dash. On this reg it is probably labeled F-. The field winding has battery voltage connected to one end(28V output terminal) and the...

Thats it, but I should caution you, that is not an as-built drawing. All the systems use the same air from the specified sources, but not necessarilly from the locations shown in that drawing.

You can clean and inspect the old style also...

Wedge brakes have a very small travel so proper adjust is important. The spring and service both being weak is an exent clue that points to misadjustment or damaged hardware. With the brakes released you should only have I think .020" between shoe and drum faces at the mide of the shoe(its in...

Same basic questions for a no-crank. Which relays in the power panel energize when you turn on the ignition switch? Do you have a low oil idiot light in the dash light panel? Depending on the truck(you didnt say what year and model truck this is) K11 and K24 or K26 must energize when you turn...

The air and hydraulic diagrams are in with/a part of the electrical diagrams...

I always first ask myself, does it really need a connector...