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The center differential lock in the transfer case (goes from 70/30 AWD torque split to 50/50 4WD) is accomplished directly by the transmission when mode is selected. The TCU outputs a signal to power that second solenoid under the dash that feeds that 1/4” line to the power divider differential...

It locks the power divider, which is basically a center differential between the axles, like the center diff in the transfer case is a differential between the front and rear axles on a 4X4(or a 6x6). Basically when not in mode if you lift any single tire, all the torque can escape thru that...

it could be a PPD issue, but I doubt it as is just a set of diodes and quite robust. The only issues I have seen with them are due to corrosion at the terminal studs as it is out in the weather. Don’t recall a diode failure. Clean all those therminals… The A0 manuals are available here on...

Small boat anchors, ashtrays, the possibilities are only limited by your imagination:)

You have 3 paths to follow. Start at the batteries, follow the ground wire hand over hand to the inst shunt, then on to the front of the starter motor, then the strap over to the drivers frame. Next check the alternator ground strap, then the cab ground strap from passenger frame rail to the...

Yes, you can delete the LBCD regardless of using 2 or 4 batteries. You can also simply unplug it... It does control the charge system failure light, but it only does so if it sees low voltage above a certain alternator RPM. The LBCD's main function is as a polarity protection device. its...

I suspect you will still find leakage elsewhere. There is an output check valve on the air dryer, so once the air is pumped past that, there should be no going back to the compressor... If it is happening while driving, i would first inspect the park air lines, anti-compound valve and spring...

The Allison will operate without TPS input, it falls back to its shift-point RPM table, but that can make for harsher shifting, and it looses the ability to call for a kick-down when calling for acceleration at speed… Not sure if there is a different/separate code for TPS data issues when using...

I don’t see any way to get ECU TPS info from ECU to TCU except via the J1939 buss…

what General said:). Probably a bad or missing buss term resistor. hard shifts are not uncommon unloaded due to the final axle gearing. Basically the mechanical advantage puts the trans clutch roll-on/roll -off PWM signaling at the end of its range. Put a ton or so in the back and it should...

Same with a relay. A relay is only polarity conscious when it has an installed diode, like is specced on our trucks, so the panel is wired so pin 86 is always + and pin 85 is always ground…

Yep, that's the diagram... Fly-back diodes are good practice to lessen arcing on the controlling sw and resultant noise, but are not typically necessary. they also help the field collapse a little faster, and of course the larger the coil the larger the fly-back, which is where the large aux...

I have never seen a fly-back diode internal to a solenoid coil, and unless they already grounded one side of it, the solenoid coil is not polarity sensitive. many starters already have one coil lead tied to ground on the starter case and no second terminal to connect to. The second terminal...

it isn’t possibly locked is it? If it were locked, like the center diff in an AWD when you go into mode, if would cause a lot of gear loading on a hard surface, do not use mode/4wd on hard surfaces… when you select mode the TCU powers a air solenoid valve under the passenger dash next to the...

What I usually do is bare metal patch, thin coat of silicone grease or copper coat(copper impregnated conductive grease) where they touch, torque in place and then layer of spray paint or cold galv compound to keep the weather and corrosion out… i really need to do a volt drop test video one of...

If I can hold my hand on it for 5 seconds, that is around 150F. Shouldn’t be much hotter than that… is it hot in the middle or out on the end of the hubs. heat is a factor of friction/load. Are the brakes dragging?

You could probably take a small alligator clip lead and connect between the ground leg on the aux start, over to where the ground lug connects to the main starter solenoid(has a short wire that runs tot he main starter ground lug on the front end of the start motor) and it will work fine untill...

Cool, you got it with a regular wrench it looked pretty tight. Mine is all exposed now. Looks like you have a workable plan!

No, I havn't taken mine off yet. One thing I do recall from the last time the thought crossed my pea brain is that the wobble cap on top of the vent is not very tall, so it may take a special wrench to reach in under the edge of the cap to unscrew it from the casing…

So that big solenoid was going click but it wouldn’t crank Untill you shorted across its big terminals? As mentioned, not a fancy part, anyplace that has truck parts around you should have one of these on the shelf…