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The electronic manuals have them listed under "Engine Electrical System Schematic" - they have the internal transmission wiring harness schematic also.

The A1+ trucks don't have a bell-housing pickup. The ECM is generating the RPM internally using the top and bottom camshaft timing sensors. Your choices are to pin the ECM chassis connector to get the dedicated tach drive much like we do to gain access to the cruise control functions, or use the...

The A1+ trucks don't have any provision for a tach except the J1939. The dedicated tach output from the ECM is not pinned much like the cruise control is not pinned. Since these trucks have no hand throttle they have no need of a tach. The A1+ winch trucks don't have the tach they just have a...

Sure they do: 3126: C7:

IDK there's some confusion as to the N1307 vs the N1307-1 The "-1" calls for the N3109 but the other just calls for "remote mounted regulator" and this listing on ebay shows the N1307 kit that comes with the N3215B: https://www.ebay.com/itm/394273400606 And yes - I'm sure on a non-C7 truck it...

I would just get a J1939 tach. Such as: https://www.vdo-instruments.com/product/singleviu-80mm-j1939-3000rpm-tachometer-retail-pack-with-harness/

Have you gone through the troubleshooting manual and done the tests on the alternator itself? Your ECM has a dedicated tach driver output so using the alternator VR is not necessary.

It looks fairly impossible on my M1079 without cutting out the frame rail and welding it back in. I'll look again though since that would be an excellent idea to do so.

Assuming it had 15w40 in the transmission already, then no. That should work fine. The military did switch to using Dex VI (synthetic is an option) in the 3700SP on the newer A1P2 trucks. FWIW. I switched mine over to mil spec synthetic Dex VI along with using about 3-4 additional gallons to...

Engine and transmission software is a more involved topic. The WABCO ABS is relatively easy but all three require paid software - there is a military version of CAT "ET" (Electronic Technician) that's floating around. The Allison software is a real PITA - they have it heavily locked down. For...

Well - the link I posted above is the actual NSN product and is $1.29 a per foot. Also McMaster is pretty high on shipping and handling typically.

4020-01-463-8181, 12450217 https://www.oshkoshequipment.com/products/detail/265/1695/Cargo-Cover-Tie-Down-Cord-Super-Rope Hooks: 4030-01-582-3410, 12420276 Not sure on sources for those. But the part numbers should give you an idea of the design.

The N1307 requires a remote mounted regulator. The alt you have pictured there doesn't appear to have a regulator or the harness so it doesn't have an excite terminal. That is literally the bare alternator - windings and rectifier, etc. Sans electronics. I can't find any mention of what that...

My primary meter is the Agilent (HP) U1252A which is what the military uses in the SWICE kits and I don't see fluctuations like that on normal DC voltage settings. Fluke may be faster I'm not sure - but I am using a $600 meter (the newest version being the 1252B which is $650)....... I would...

These alternators have a lot of ripple. Niehoff considers it normal and it's an effect of the slow brushless response. 15v-16v is too high. But the fluctuation is normal - really need an oscilloscope. DVOM is not a great tool for this job. Even an analog meter is better that that digital mess...

No shunt on a C7 truck. Can confirm.

The 260 mount is different. The upper bolt threads into the alternator ear which is behind the (thinner) mount ear.

It's a $400 Chinese 24v mini-split. Works well for what it is - blows 40 degree air a decent rate. I just don't think it would work as good or integrate as well as the Red Dot. I should have said "defog" - the air drying for defrost becomes less necessary the lower you go in temperature - so...

Huh? Not feeling like we can help this one. :rolleyes:

I've got the Red Dot gen 2 system in my truck and it works great. I also have a 24v DC unit in the habitat and it...... blows cold air. Admittedly the habitat is a dark color and aluminum - the awnings help and I've got real big windows to assist with ventilation. The reality is it's really only...