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Pull relay K07 and install a jumper wire with 1/4” spade terminals between pin 30 and 87 in the relay socket. This will turn on your headlights and take the light switch out of the equation for testing. If the lights work ok this way, pull the jumper and move relay K20 to the K7socket and use...

point it down:)

Looks like you could hang a snowplow off of it:) Is that blue line running across the front of the engine the makeup line from the expansion tank?

In place of a rubber cover, the rtv keeps a dropped wrench from arc welding itself in place. Not needed on the ground stud though, only the + terminals on the solenoids and starter motor… later A1 trucks added the battery disconnect relay and the LBCD to control it/ disconnect the load/batts...

The battery ground lead cable runs to a stud on the front of the starter motor housing. From that stud there is a braided strap over to the drivers frame rail. That is how battery ground reaches the rest of the chassis… voltage drop tests can be run on all these circuits if you have a battery...

Have you cleaned the connections on the polarity box/LBCD back by the spare tire? How about ground strap between starter and drivers frame? the alt relies on a good connection between alt and batt, all 3 of them, 12, 24 and gnd…

Well they all communicate on the same data-bus…

Emer braking should cause it to vent air from the anti compound valve vent, just like it does when you release park air/set park brakes. Was working on a video on this, but got sidetracked last week:)

measure the voltage at the alt. flashing green means it thinks its voltages are normal...

While you are messing with it, pick your best 2 batteries and only hook up those 2 in series(keep one inner and one outer battery/remove the forward two or the rear two) Four 120AH batteries series parallel(240AH) is way too much for the 50/50 alternator to charge properly, and a horrible load...

Just measuring with a meter is not a real test. You must test with load applied…

What year/model truck? Rule #1 voltage is NOT good unless tested good UNDER LOAD! do you have a voltmeter? If not get one and measure the power at the batteries when you push the start button. It should drop no lower than about 10-11v if that is OK, measure voltage at the 12 and 24v...

Started this schematic a while back and finally finished it, condensed from the pages of schematics for the A0. Just the basic on-truck lighting, no blackout, rotating beacon, park or 24v commercial trailer circuits(its complex enough without all that:))

Well there are 2 brake-light switches in parallel, so I suspect the issue lies elsewhere. Sadly, the light circuit is the most complex/convoluted on the truck:) lets start with just the brake circuit. 1. Do any relays in the panel energize when you step on the brake pedal? If so, which ones...

Yep, select service drive, by raising the short lock lever to allow you to rotate the top lever to the service drive position. You also do not have any brake lights until you do this…

Yea not a friendly assembly to crack, and I doubt you could get individual parts from Neihoff, just the entire reg assembly if you can find a source To sell to you. And of course uncle sugar pricing applies… the biggest advantage of brushless alts is that they are brushless:) no brushes or...

@GeneralDisorder this is the pic I was referring to. If the red arrow is the horn, thats the right cab pivot in at the end of the yellow arrow. Looks to be attached right where you put the ground:)

its not really under the dash, it runs thru the middle of the dash. the motor is under the relay/fuse power panel. remove the PDP cover, and there are screws up under the top lip of the opening, and on the face of the dash toward your knees while seated. remove those and the power panel...

On an A1 yes. The 3rd pic of this last set appears to be an A0 grill and you can see the round part of the pivot right below the bracket…

well 6 and 7 wont hit as hard as they are smaller ratios. AWD is not the same as 4WD there is a center diff in the transfer case that allows different wheel speeds front to rear. Mode locks that center differential to put you in 4WD and if you are on pavement where wheels cannot slip/spin, you...