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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?

I take 2 jumper wires and twist 2 ends together(like a V) and insert it into pin H/24v source. You install one jumper H-R, that powers the control solenoid which must be powered to seal the system and allow it to hold pressure. If you then take the end of the other jumper and apply power...

Sounds normal to me... The CTIS dump valves dump briefly at the end of EVERY cycle. Tgey arecremote pressure regs. They pass input to the wheels when the input pressure is greater. Anything over 5psi sent to the wheels opens the wheel valves. When the input side of the dumps is lower than...

Anything over a group 27 will provide plenty unless it is VERY cold. Cat specced a pair of group 31s for the equipment using these engines. A 31 typically delivers ~1000 CCA... All the kodiaks out there with 3116/3126 engines use similar battery size. I measured my 3116 start current once...

Mine varies about .05V from 28.56 to 28.61 measured with a fluke 87 at the alt this morning. AC showed ~.4V of ripple... That is up from last year, and it has typically been ~28.2V, so i may have something going on there. The 14v is still right around 14.1 on the dash, but didnt put the...

The oil pressure gauge and gauge sensor is not related to the start circuit in any way… the only thing they have in common is they both sample engine oil pressure… There is a separate oil pressure switch that is plumbed into the oil system on the lower drivers side of the engine block near...

Well I mentioned it earlier, if you set your meter for AC, it will read the ripple as an AC voltage. It is a little easier to quantify it that way, and actually assign a voltage closer to the peak of the excursions that the display cycling, is probably not catching. Thats a decent meter he is...

Well if you hooked the batteries up wrong, either nothing will happen because the polarity box will prevent flow, or things will get really hot. If a good battery was dropping to 3V because of load, something would be getting really hot. Sounds like a bad battery. Are they charged and do they...

Those should be way steadier than that. One of 2 things is probably happening. Either the alternator regulator is not able to stabilize the voltage, possibly due to bad connections, or the load itself is unstable, possibly due to bad connections ect. if you disconnect the exc lead from the...

Yes. They feed air from tge supply inlet port to the output port to perform an action. They stop supplying air from inlet to outlet port and vent/release the outlet port pressure when done performing the action. Commonly known as a 3 way 2 position valve. If leaking, supply/inlet is leaking...

Ok, first off that pic you posted of a shunt is from an A0 schematic... as far as I am aware they did not use one on the A1's... a shunt is used to measure current flow, and on the A0 it was in the ground path. Its output only fed the STE test plug... Battery ground should go direct to starter...

Those are the fan and center diff air control solenoid valves. I identified a replacement, about $29 in a youtube vid under my usermame there, Rronmar...