Thanks for the replies.
I just followed the TM guides on testing the gauges. I haven't worked on these before, so I wanted to post my findings and get a feel if that was normal or not. Sounds like is is Acceptable for these units.
I opened up the interrupter and the seal looked good and the contacts were pretty clean. I brass wire brushed them clean and reassembled.
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I could not find much info on the shunt part, but it looks original, so I am going to assume it is ok.
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I got a can of deox/electronic cleaner and sprayed down that phase/voltage switch (S6 I believe?), and the S8 switch for the measurements. Moved them around and sprayed some more. Hopefully that cleaned them out.
So, I could not find any replacements online for this model 19260 transducer, so I figured I would take a try at fixing it. I am not great at electronics repair, but I know some.
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After desoldering, testing, and re-soldering way too many parts (had to test them out of circuit), most checked out fine. A couple of resistors had drifted a bit from spec, but not too bad. I decided to mess with the two potentiometers and hope that would do some good. I couldn't see all the traces to the pots, but It looked like they may adjust the 555 timer IC, so I figured they might be a fine tuning calibration.
Well, the output jumped all over the place when I touched those! Seems like there was wear or corrosion inside the pots somehow. I exercised them a lot, then adjusted them close to where they were originally and was able to get it working! While plugged it into the wall, I calibrated it to 100uA DC with the pots. The left one seemed to be more of a fine tuner, with the right being coarse. But I am not sure so I tried keeping them both close to the original marks.
I haven't tried it on the generator yet, but it seems to be good now. It is a little worse for wear thought, lol.
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So, yea I think people could try to repair these.
If yours is just out of spec, I would check the two grey adjustment potentiometers on the front. Mine were messed up inside and needed to be exercised. I also had to fine tune it a little, probably due to resistor drifting or the pots.
If you have no output, and nothing is obviously burnt, I would check the fine wires on the 120V/16V transformer leads. One may have just broken loose. Don't ask me why I had to figure that out, sigh...
Hope this helps someone.
Going to do the oil gauge mod next. And I ordered a new thermostat for when I flush the radiator. Still working on it.