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Maybe something caused the truck to loose excite voltage. The white wire on the front regulator terminal needs to have 24v when running or the alt will just spin and not make power. I believe the way the truck was intended to operate, when oil pressure comes up once the engine starts it triggers...

Maybe bad ground. Try adding a big negative wire from the batts negative to a sanded spot on the main frame rail. There are relays under the power board that control 12 and 24 volts to the panel. The panels can develop bad solder joints. Relays go bad over time.

The battery voltage code is the one you want to hunt down first. Replace relays clean breaker panel tabs. Polarity box connections etc. Low voltage or loss of will cause all kinds of codes.

They are not the same. I have replacement ones

If you have an a1 truck, with that black controller you can plug in and see whats going on.

Maybe bad ground and power feeding back somewhere

I have new and used lbcd

You can cheat and run a wire from the fuel solenoid positive around the front of the motor to the regulator front terminal

Wire rubbing shorted somewhere. Bad lbcd under spare tire.

The 3126 a1 trucks can develop issues with the power panel circuit board. I have those too.

I have a spare trans tcm. Do you have power to the tcm. They keypad is powered off the tcm

If you recently got the truck with dead batteries and someone tried to jump start it that somehow spikes the trans tcm. You can see if you have power to the tcm. The keypad gets its power from the tcm.

I have the replacement tcms for your truck

There is only one regulation terminal. The front 24v. It divides to get the 12v output

Run a new ground cable from the batts negative to a sanded spot on the main frame rail. I would then run a temporary wire from the battery positive to the front terminal on the regulator. See if your voltage still drops out.

The lbcd is involved with voltage regulation. When you put battery voltage directly to the front regulator terminal you are bypassing all of that. If you have battery voltage at that terminal the alt should put out proper voltage. Did you make sure the alt had a good ground strap. Ive seen...

Bad batteries can cause a voltage spike and shut the alt down but you would still have battery voltage at the dash gauge. Does the truck have a small box to the right of the battery box? There is a low voltage cutoff relay in there. I would also check all the grounds. The main ground cable goes...

Is it a 3126 engine or 3116

Sure send me some pics. Got fb messenger easier to use

I may have that too.