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  1. BeastMaster

    Voltage regulator?

    Now, I am convinced you are just as much of an old coot as me! Already looking forward to the latest post on this saga. Sure rootin for ya!
  2. BeastMaster

    Cheapish 8cyl p pump

    Thanks for the replies to my concerns. Y'all brought up several angles I had not considered... Like bringing up the value of these which will keep an otherwise perfectly good IDI from uselessly rusting to Oblivion in junkyards, or worse, going to an ignominious end in an iron smelter. The IDI...
  3. BeastMaster

    Cheapish 8cyl p pump

    I may be a little bit tree hugger here, as I don't know how many of those IDI block castings have survived, but know they aren't making any more of them. Every one of them destroyed is gone forever. I guess I don't give much of a damm about anything later than IDI, as the IDI was the last of...
  4. BeastMaster

    Voltage regulator?

    I was just looking at Rock Auto and was not all impressed at the price of a standalone regulator. Given that, I'd do the same. Just replace the whole assembly. And keep your problem child in the shed as a parts donor. You've done far more than your fair share of chasing wild goose on this...
  5. BeastMaster

    Voltage regulator?

    Frank, seems like that was how the generator on grandpa's car was wired. Putting current into F got a lot more out of A, providing the motor was running. The trick was to get the generator disconnected if the motor wasn't running, lest the battery would discharge through the generator...
  6. BeastMaster

    Voltage regulator?

    While you're taking everything apart, could you remove the regulator, inspect it for any corrosion, especially around anywhere the regulator ground connects to the alternator frame? It's just a possibility, as theoretically, a poor connection there would cause the situation you describe.
  7. BeastMaster

    Voltage regulator?

    I think Selahdoor's voltage is too high. https://batteryuniversity.com/learn/article/charging_the_lead_acid_battery Actually, his is off the chart. I don't have enough experience with the glow plugs to offer much advice. I know mine are new Berus, appear to be working properly, and cycle...
  8. BeastMaster

    New to the idi family

    You were sure at the right place at the right time. Welcome to the group! I believe you just got something that will outlast darned near anything made today.
  9. BeastMaster

    Voltage regulator?

    I'd do it too just to rule it out. Regulators don't fail very often. Or, at least not nearly as often as those old mechanical ones 50 years ago did However connections are quite failure prone, despite their apparent simplicity. Corrosion causes the damndest hard to find failures by...
  10. BeastMaster

    Voltage regulator?

    That voltage is hard to measure accurately, as it's a pulsating DC as the armature poles pass by the stator poles, with it's frequency in the hundreds of hertz, a function of engine rpm. Even "true RMS" meters can have problems measuring it precisely. And to make it worse, it's only one of...
  11. BeastMaster

    Voltage regulator?

    Just to answer this.... Yes. It's an output from the alternator that's already being told to put out too much voltage. It's a symptom, an indicaton, but not the cause.
  12. BeastMaster

    Voltage regulator?

    Well, looks to me like it's nailed...and you never needed any of those fancy testers. Just an understanding of how it works. For me, it's Grandpa's old Triplett 630. Close enuf for most things. Hope you get a good night's sleep.
  13. BeastMaster

    Voltage regulator?

    Just to be sure you are measuring the A voltage as seen by the regulator itself, you might wanna make another test thingies like the one you just made and connect it to the other brush screw on the back of the alternator. The schematic shows ie being internally connected to the A connector pin...
  14. BeastMaster

    Voltage regulator?

    I think you are damn close to nailing this beast. You look at F screw to ground. Its right at battery voltage. Great. As it should be. You start the engine. It catches. It begins spinning the alternator. The regulator sees it and drops the F terminal to 1.24V. Great. As expected! Then...
  15. BeastMaster

    Voltage regulator?

    That's why I try to teach and show how something works instead of barking instructions. Once one sees how the magic works, he can throw the instruction book away. Any job is much harder if one is in unfamiliar surroundings.
  16. BeastMaster

    Voltage regulator?

    Whoops. Just saw your post so I will edit my reply... It puzzles me why not-running A S I is 0, 12, 12. I expected 12, 0, 12.
  17. BeastMaster

    Voltage regulator?

    Those voltages are way off. Meter set up for DC? A should be same as battery voltage S is a pulsating DC voltage if seen with oscilloscope. I will be battery voltage, or ground if it's trying to light the "battery" indicator lamp. Beautiful diagram. Wish I could do that in a timely manner.
  18. BeastMaster

    Voltage regulator?

    Well, that kills my belief of a shorted transistor. Now, what's left is seeing what the F screw does during engine run. The regulator should pull it to ground when the engine catches, then let it go back up as the battery voltage approaches 14V.
  19. BeastMaster

    Voltage regulator?

    Touching that F terminal to ground should turn the alternator full ON. Typically used for seeing if a dead regulator or a dead alternator is the culprit of a no-charge situation. I am pretty damm sure your alternator is fine. Since you've made a nice test point there, measure the voltage from...
  20. BeastMaster

    Voltage regulator?

    Thanks, Frank! I think the confusion is in how I am interpreting and assigning labels. I see terminal "A" as the power terminal to feed current into the armature rotor to establish a magnetic field. This same line is also sensed by the voltage regulator, which gates this voltage, or some of...
  21. BeastMaster

    Cheapish 8cyl p pump

    1000 HP IDI ? I guess the head gaskets, crankshafts, bearings, rods, and pistons are made from pure 100 percent unobtanium? For me, if these pumps are hyper-reliable, that would justify it... Even at NA power level. How many minutes to EGT meltdown at such high power? Now, if I could fix my...
  22. BeastMaster

    Voltage regulator?

    I was looking at the wiring diagrams... The regulator has a three pin connector, pins labeled "A", "S", and "I". A is the power to the armature. It is connected to the main battery buss, same as the main alternator output. The regulator will gate current from this line through the brushes and...
  23. BeastMaster

    Voltage regulator?

    It's gotta be the regulator, one way or another... Either it's bad or bad connection like Franklin above pointed out. Should you open the field current drive to the alternator ( the electromagnet on the armature ), you should get nothing out of the stator coil...that's the DC electrical power...
  24. BeastMaster

    Voltage regulator?

    I went back through this entire post and noted an earlier entry about an apparent lack of charge or parasitic drain. Now, should your output current pass transistor fail shorted on your voltage regulator, it won't be able to turn off when you shut the engine off. It may be keeping your stator...
  25. BeastMaster

    Voltage regulator?

    Something is amiss with the voltage regulator. The alternator is putting out too much. And it's the voltage regulator that's telling the alternator to do it. To do this, the voltage regulator sets the magnetic field strength in the alternator by controlling the current through the rotor. It...

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