Re: Bob M or John T, W6 electrical problems

Posted by Bob M on March 19, 2007 at 10:03:22 from (151.190.254.108):

In Reply to: Re: Bob M or John T, W6 electrical problems posted by chadd on March 19, 2007 at 07:39:10:

OK – Sounds indeed like the ammeter wired correctly and is working properly. Now I’ve never heard of a generator that “won’t polarize”…. I suppose it’s possible but I’ve never heard of it.

Anyway next step is determine whether the generator is at fault or the problem’s with the regulator. Here’s how I’d do it (I’m assuming the wiring is in good shape and properly connected):

1 – Disconnect both wires at the generator. Tape the ARM wire terminal so it cannot be accidentally grounded.

2 – Run a temporary wire from the generator FLD terminal to a good ground.

3 – Take another temporary wire and connect one end to the BAT terminal at the regulator. Then briefly touch the free end of this wire to the generator ARM terminal. (This is to polarize the generator again.)

4 – With the free end of this wire isolated (temporarily tape the end), start the engine and run it at governed RPM. Now take a voltage reading between the generator ARM terminal and a good ground (generator frame). If the generator is working the voltmeter should read somewhere in the range of 15 to 30 volts or so. And assuming the battery positive post grounded, the generator ARM terminal voltage will be negative relative to ground.

If you get a very low voltage reading or if the ARM terminal reading is POSITIVE relative to ground, stop. It's the generator that's messed up. However if the generator output checks out:

5 – With the engine still running at speed, have an assistant watch the ammeter while you temporarily connect the free end of the wire installed in step #3 to the generator ARM terminal. (Expect a spark when you connect…) If the ammeter now indicates a full charge, the generator is OK – the problem is the regulator. However if the ammeter again shows discharge, the problem has gotta be the generator.

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Hope this makes sense, and advise what you learn!

Replies:

• Re: Bob M or John T, W6 electrical problems chadd 10:16:27 03/19/07 (8)
  • Re: Bob M or John T, W6 electrical problems Bob M 10:48:14 03/19/07 (7)
    • Re: Bob M or John T, W6 electrical problems chadd 11:27:14 03/19/07 (6)
      • Re: Bob M or John T, W6 electrical problems Bob M 12:33:41 03/19/07 (5)
        • Re: Bob M or John T, W6 electrical problems Clip41A 13:26:24 03/19/07 (4)
          • Re: Bob M or John T, W6 electrical problems chadd 14:32:22 03/19/07 (0)
          • Re: Bob M or John T, W6 electrical problems Clip41A 13:42:43 03/19/07 (2)
            • Re: Bob M or John T, W6 electrical problems chadd 14:13:07 03/19/07 (1)
              • Re: Bob M or John T, W6 electrical problems Bob M 18:01:38 03/19/07 (0)

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