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Yep, I remember learning that from you troubleshooting your alt. they switched from low side to high side PWM field control between the 100A and the 260A. They may have done it between the older 100A 1506-1 and the 1509 when they changed the second screw terminal to deliver AC output for the...

I think it is looking for the interactions seen in the series string. IE: if it adjusts the 28V it is expecting a comparable movement in the 14v side and vis-versa. or perhaps for a given amount of 28v field drive to reach 28v, it is expecting a certain amount of 14v SCR drive to reach 14V. Say...

Please tell me more about the 3rd pic, the altered battery box diagram… yours isn’t wired like this is it? What I have observed playing with my 100A Neihoff is that it is configured as a battery balancer. It is looking for a 12v connection INTO THE MIDDLE of a 24v series battery string. When...

Yea the way they configured that cylinder, they really set it up for failure. You can drill out the outer seat and remove the check-ball. You may also be able to unscrew it. It may have notches, or an easy out may be able to get a bite on it to unscrew it(havn’t studied it, removed my crane...

Ok, of all the messed up things I have seen people do to diesel fuel systems, not understanding fully how they work, I am finally able to say this isn’t so bad… the pump looks like it has adequate flow(100-165GPH?) usually what I see is someone throwing one of those autozone inline diesel...

So what are we looking at here? I recognize the hydraulic pump:) what model fuel pump is that?

Ok, just because you didn’t touch anything in the cab, doesn’t mean something isn't wrong… first, a 95 will be an A0 truck it does not have a LBCD, it has a Polarity Protection Device or PPD(diodes in a heat-sync). Your alternator cables are on the wrong terminals. The batt and alt terminals...

looks like an appropriate solution...

If the batteries are charged and in good shape, it shouldn’t matter 2 or 4… Thats the point of the regulator:)

Not the ones I have seen:)

The mil manuals/schematics don’t show the engine side of the ECU wiring on the 3126/c7 trucks…

The tach on the A0 is driven by a magnetic pickoff sampling the 133 ring gear teeth. It is screwed into a port on the bell-housing on the drivers side top just to the rear of the primary fuel filter…

The troubleshooting guide has a flow-chart to work thru to help you determine if it is an alt or a regulator issue. the field should collapse very quickly when exc 24v is removed…

Excellent! Thats how its done…

Yep, the biggest killer of batteries is low state of charge. In meeting the cold crank milspec without properly sizing the alt to support so large a battery bank, they set up a situation where the batteries have trouble reaching full charge unless run very long hours. Depleted batteries keep...

You can drop to two batts at any time, simply lift the battery leads off of the terminals of either the forward or rear pair of batteries and insulate those connections. Unless you are running the 260A alt, four 6t batts can be really hard on that very ecpensive alt. 2 batts are a much better...

While you have it unplugged, measure the resistance of the sender...

What happens if you unplug the sender on top of the tank?

What was it?