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I need to track down those other 2 chassis connections. I can see the one for the cab and I should be able to rework it once the cab is down. I need to find TL64/65. Is that right next to the starter? I can't remember when I had that apart but I thought there was a braded cable there. Those...

Getting close to finishing the wiring changes for the alt and found this today. Ground strap connection did not look good underneath the lug. (That dang nut was near impossible to get to, and get off). The Paint is thick on that connection. Curious whether that's a factory job or field job...

That's a pretty nice video on the topic. Probably Should be required viewing for ownership of this truck lol. I'm already at .5v drop and I only tested across 1ft of circuit. Time to start polishing terminals. I feel like I'm back at breaker maintenance oversight duty.

Found some evidence of melted connections on the 28v side of the manual disco. The bus bar insul is melted. Not sure when that ever happened but some of the post threads are melted away. Oddly, the 2 compression washers were installed on the 14v side. Those are supposed to keep pressure on the...

Even with the alt out of the truck, I was able to do a quick Vdrop test across the 28v circuit between manual disco and the load side of the power relay just using the ignition. the AIH pulled 74amps and the vdrop at the test point was 0.540v. That comes to 7297 uOhms, or 7.297 milliohms of...

I finally found the place in Junction that does alt rebuilding. They do starters as well. That's their M.O. Im taking the old starter there to have that rebuilt or at least serviced beyond what I can do. I'd like that around as a backup. So maybe they can test this alt too. I still have the...

That was the expectation. I put my regular old box charger on them after this test and it was running ~15amps to start (12v individual charger) on the analog gauge. On my pulse-tech conditioners, they're showing 75% today so maybe some sulfonating? Might as well let napa test the alt since...

The DMMs were measuring at the batts since the leads like to fall off on the vibrating alt. There was not a ton of current flowing. Spot checks on the alt were the same volt numbers. The batts were showing 45-50% cca test, so not new. These are 3 yrs old +/- a few months. My issue is that...

Sorry I'm rush typing. The batts were at 24.8ish as a set before connecting. My system voltage was 28.8 coming from the alt. The non producing part is within the alt. It's producing voltage, but not meaningful power, at least not at 0-6 fluctuating amps on the probe. I think it's shorting...

Does the current fluctuate with just batteries connected? That's what I took from this test. That should not be happening. And after running for about 15minutes, even with 28.8volts, those 2 batteries were not charged any more than when I started, per the batt tester. The alt is not...

Maybe a candidate for your future experimentation lab

https://youtube.com/shorts/w6CH1vJGB1U?feature=shared

I did the external battery test today. See pics. Fun and interesting times in the barn lab! no smoke or sparks were seen 😉 I used 2 x 100ah deep cell AGM batteries that were 45-50% charged per the batt tester. They read 12.55 on volts. The results were similar but on a smaller scale as...

You gave me an idea. I have the original Cat alt from 1986 that died on me. My cat mechanic buddy from FB told me those have a diode that burns out. I could probably fix that and then see if it will drive this neihoff lol. It's only an old 24v 50A alt. More Fun with my barn junk

Low side control would be typical for a scr controlled device, since the cathode always has to be on the neg terminal, with nothing in between. Otherwise, there's the potential for reverse biasing and then no current would flow. This site is always nice for researching circuits...

If I knew more about their internal circuitry, I could certainly build a plc based driver for their field, bypassing their reg. Without knowing their circuit, I'd be guessing at the min & span that the field needs to see for current. I guess I could just hook into the connector first and see...

You guys are going to make me do it I suppose😉. I have the stuff to test it that way, just been making excuses. I'll try it tomorrow. I have some electric hot plate coils that are 2 & 4ohms that would make good basic loads.

Yes on the numbers with ign on and engine off. The truck is sitting there now like that bc I have the alt disconnectedboth power leads open and E is open. the 14v value is odd at and after startup. Ill do another video off it. Seems like the vr balancing is moving around. During AIH, it goes up...

No the 3rd pic is a draft of what I may do if I convert to a 24v only alt with victrons making 12v within the PDP. It only needs to be one battery but I made the drawing anyway. Sorry, didn't mean to confuse that. I wasn't sure if the 100a neihoff would operate As 24v only. I think you...

I'm wondering what you think of this. You may have covered this in another thread previously. But after doing some node analysis, I realized that with a dual volt alt, you can never have equal current thru both batts. See pics. i2 is never equal to i7, although they could be "close" in...