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@Scoobyshep @kloppk - Hoping you guys have some insight for me. Installed the new AVR today (opted for the correct one, not a universal one). After install I'm back to getting 4 VAC out of the alternator, and across red to red at the AVR. However, If I try to flash the yellow/blue wire with...

Update - Still getting between 40-60 vac out of the alternator. Went back to step 1 of the troubleshooting and re-verified some steps. Red to Red at the voltage regulator is about 33 vac when running. When I try and flash the blue / yellow at the voltage regulator with a 9v battery, anything...

Update - Thanks to everyone and their suggestions. Turns out I didn't have to pull that rear bearing housing at all. I forgot the generator spins, and after remembering, I was able to bump it over and access the diodes. Spoke to the sole Mecc Alte dealer in the US. They sell a ton of these...

Right on; I appreciate it.

Yeah, as soon as I touched the DVOM probes to the diode leads, they just crumbled. Do you know how this bearing carrier comes off? Do I need to use a puller, or should it just pry off?

Yeah, after I posted I realized pictures would be helpful...haha. Thanks!

@Scoobyshep @kloppk I got distracted by some other projects, but I'm finally tearing back into this generator. This morning I removed the rear vent cover to try and find the diodes. As expected, it was tight and I had to disassemble the generator body slightly, but I'm now working wide open...

Scoobyshep ok, perfect. I was just reading the diode test section in the manual kloppk linked and it lays out the procedure pretty clearly. I shouldn't have an issue once I can get to them. I will also try and reflash the genhead as outlined in this manual. Hopefully I'll have some results...

Scoobyshep Ok, cool. I will see what DC power supplies I have around the house and may be able to cannibalize one for a higher voltage to try what we've been doing. I'll also look into the 12vdc / limiting resistor process kloppk linked. If all fails, I guess I'm going diode hunting.

kloppk Thanks for the link! I'm reading it now. From what I understand, I need to find the diode bridge, then test the resistance in each diode. I'm looking for a high resistance in one direction, low in the other? I have no idea what a diode bridge looks like or where on the genhead it is...

Yes, when powering the coil with 27 vdc, the meter was showing .25 amp draw between the positive lead of the battery pack and the yellow wire/terminal. So if I buy a variable power supply that can go up much higher, say 60 or 80 vdc, with adjustable amperage under 6, I should be ok doing what...

Scoobyshep 3 9v in series - no change in output voltage. Left full 27 vdc hooked up for at least a minute straight. it's pulling down about a quarter of an amp between the 3 9v and the yellow/blue if that makes any difference. Also, the regulator is labeled as UVR 8172 TC if that makes any...

Yes, engine running. Haha. I will start with short taps of the 27vdc, but if that doesn't work and I work up to full time power, is there a max amount of time I should apply those 27 volts to yellow/blue?

Scoobyshep OK, I tried 9v to blue / yellow in increasingly long taps, working up to full time 9v with no change in output voltage. Ran 2 9v in series and started introducing 18vdc in short taps, working up to full time application of 18vdc between blue / yellow with no change in output...

Scoobyshep Ah, ok....I was being ultra careful and only did about about 1 minute of very short taps. I will try again tomorrow with slightly longer taps, slowly working up to full time 9v. If that doesn't do it, I will add another 9v in series and introduce 18 vdc, starting in small taps...

Scoobyshep Did as instructed; no change in output voltage. when tapping the positive to the yellow, I was getting some little 9v arcing, so something was definitely happening but it made no difference in output voltage.

Scoobyshep I just want to confirm this is what I'm to do: Disconnect Blue Leave yellow hooked up 9v battery - negative to the disconnected blue wire, not the terminal it came from positive to the still-hooked-up Yellow wire/terminal in short taps only Watch the output...

Scoobyshep / kloppk : Test results: Motor off, Yellow & Blue disconnected = 10.8 ohms Motor off, Red & Red disconnected = 1.2 ohms On startup, Yellow & Blue = While cranking/initially startup .07 vac which trickled down to about .015 vac over the span of 15 seconds running While running...

Thanks for the info. To clarify - here's the operating manual which has wiring diagrams: https://www.steelsoldiers.com/attachments/tm-52480-23-generator-pdf.674268/ Page 69, lower left quadrant, I'm looking for the voltage between "Exciter - YELLOW" and "Exciter - Blue"? Used to be in the...

Howdy. Last week I picked up an Applied Companies 23kw 3 phase genset / 120k btu ECU trailer. After some basic mechanical fiddling, I got the Perkins diesel running nice. (except I don't think the glow plugs are being energized due to no glow plug light, but it's plenty hot here in TX for...