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Generator advice needed (12volt) 444-544

posted by  stevewa on  Sun Aug 29 14:35 CST 2004
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So we're out having a nice drive in the PV when after about an hour the dreaded "AMP" light comes on nice and bright.

Head home, let things cool down a bit, then re-start to see if a thermal problem. Nope, AMP light still on.

Take off fan belt, generator spins freeley, nothing seized up. Took generator off car, cleaned up, no sign of any arcing or other problems. Brushes look nearly new. Can't get inside regulator because the aluminum screw's phillips head is totally stripped. Tried applying power from a low-amp source to the D+ terminal, tripped breaker on power supply (5A) and did not spin the armature at all. Measured resistance, looks like dead short between DF and frame, very low ohms (4-5) between D+ and frame.

Manually spinning the pulley did show a slight voltage at D+.

Any ideas? What should I be seeing for resistance inside the generator? This is a '64 with the later-style 12v generator (open in the back, with no lubricating cup).








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    Generator advice needed (12volt) 444-544

    posted by  dencat on  Mon Aug 30 06:56 CST 2004
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    last visit: Wed Dec 9 17:36 CST 2009
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    If it turns out that your generator or regulator is bad, and you want to stay with that set up, I have a generator and regulator that came with a 63, 544 I bought about a year ago that was converted to an alternator. If interested, let me know and they are yours for the cost of shipping. I am in Eugene so if you are in the area you can pick them up. I don't know what condition they are in.
    DC








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    Generator advice needed (12volt) 444-544

    posted by  someone claiming to be mjamgb on  Mon Aug 30 05:22 CST 2004 [RELATED]

    If you applied voltage from battery to generator and you got no spinning, then generator is bad and need a new one. The "test" should be done with the ganerator completely dis-engaged from the electrical system (except the chassis ground, of course). If you did it with the regulator hooked up it will tell you nothing.
    If the generator spins (as it should as you got some small voltage spinning by hand) then the regulator is bad and you need a new one.

    Have heard that you can cut open the regulator and clean the points for a temporary fix (tape cover back on).

    Mike!








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      Generator advice needed (12volt) 444-544

      posted by  Ron Kwas on  Mon Aug 30 05:42 CST 2004
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      last visit: Fri Oct 24 04:03 CST 2014
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      Mike;

      In order to perform the "Reciprocity (wherezat?) Test", and run the genny as a motor, you also need to ground the field connection (Df) in order to make field current. See:



      Steve;

      The low resistance measured from Df to case is normal! See also: http://www.intelab.com/swem/service%20notes.htm#Electrical%20Equipment

      Good Hunting!








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        Generator advice needed (12volt) 444-544

        posted by  someone claiming to be mjamgb on  Mon Aug 30 09:57 CST 2004 [RELATED]

        Ja, sry been swappin to alternators and so we... what was the topic?

        Now that I've been reminded, I can clearly recall doing it and rigging jumpers.

        Mike!







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