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

I can show that the military is so fed up with the 100A alternator situation and having to constantly replace them to the tune of $2k each that they have gone to the trouble of making 260A upgrade kits for every FMTV even back to the A0 trucks (which a few are still in use by the 82nd as I...

An interesting aside to this observation - I recently picked up a 1984 M1009 CUCV (Chevy K5 blazer military edition). It runs a similar hybrid 12/24 system to our trucks and has the ability to run two 6TL batteries..... GM was present in class the day that S&S was playing hooky. These trucks...

I'm not an expert - I have a dangerous level of understanding from a working mans non-EE (software in my case) engineering experience. That said I feel like the problem is very tricky for the VR to contain - these alternators have multiple stages - in fact the 12/24 dual voltage alternator has...

Induction motors - which brushless alternators share much in common with - are REALLY dumb. If you ask more of them then they are rated for they will GIVE everything they have to try to stay at their rated RPM and will die in the attempt if too much load is put on them. The amount of slippage...

Well - it's either the alternator itself or the voltage regulator that's the failing..... the preponderance of evidence though suggests that they were not ultimately capable. The fact that later trucks were upgraded to the 260 despite actually having less load with LED lighting suggests there...

They claim this in the documentation - I'm a bit skeptical at least as regards the 100A alternators. If that was the case and they limited themselves to their rated output and they were capable of 100% duty cycle then what's with the high failure rate and eventual upgrade to the 260A units? If...

Interesting - my discussion with an engineer at Niehoff indicated that these alts - brushless alts in general as I understood it - were slow to respond to voltage changes and also AC ripple of much greater amplitude was considered normal. Now I would love your EE explanation of how the LBCD...

This is a 1079 A1R truck that came with the 260a stock. The LBCD is rated at 200a on it's data plate so I would assume it disconnects around/above 200a.... But there's nothing that says if that's the 14v or 28v or combined rating. And the LBCD relies on the VR to send it the load signal which I...

So the question is - did these guys leak or did they blow up? Given I have the 260a alternator.... The truck did already have a newer voltage regulator when I got it. Given the state of the connections though I'm not that surprised.

Yeah you can't see them because they are set in the epoxy - but I can test between the batt and load terminals and they are definitely present. There's about a 0.4v drop in forward bias so I'm guessing a Schottky Diode is being used. I don't know the size of them but I would assume they are...

Battery disconnect is the pair in the box on the back of the battery tray that has the manual disconnect on the underside.

There are big honkin diodes set into the epoxy with the main studs such that it protects against reverse polarity. There is big caps to suck up any massive voltage spikes such as when the LBCD trips the battery disconnect. And there is rudimentary circuitry to monitor how much load the...

Got it torn down. Took an epic amount of digging out the silicone impregnated sand..... Will generate a rough schematic based on the circuit. Looks pretty straightforward as far as what this thing does: Haven't decided if these leaked or got blown up. Rick

These are BIG caps. Near as I can tell they have two 120,000 μF @ 16v caps on the 12v side..... I haven't dug far enough into it to see the rating on the top two and I'm just guessing they might be different because up there is the 28v side. Purely a guess though. And yes - I'm guessing to cut...

When addressing loose and corroded connections at the LBCD I noted that several studs were loose in the housing. After confirming with several members that this was a clear indication of failure (the unit is no longer sealed against moisture at the very least), I procured and installed a...