12v Generator Model 65

Electrical issues
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12v Generator Model 65

#1

Post by panhead_kicker » Thu Jul 19, 2012 1:42 am

Is likely (or even possible) for a stock 12v model 65 generator to put out too much current for a regulator to handle? Current check per the service manual was 23 amps and increasing before I had to disconnect my ammeter rated for 20a un-fused. Reason I am testing is because my solid state reg. Is shedding it's solder at the battery terminal after a couple of miles. Then the gen. Light comes on. I re-solder and it lasts for another mile or two. Ran this setup for several k miles with no problems until now.



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Re: 12v Generator Model 65

#2

Post by awander » Thu Jul 19, 2012 1:47 am

Assuming you have an electronic version of the stock 3-unit 12V regulator, the regulator is what controls the amount of both voltage and current that the 2-brush generator will put out.

What kind of voltage are you seeing?

Either way, I'd look at the regulator as the cause of the problem first.

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Re: 12v Generator Model 65

#3

Post by john HD » Thu Jul 19, 2012 2:35 pm

sounds like the field terminal is grounded.

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Re: 12v Generator Model 65

#4

Post by Cotten » Thu Jul 19, 2012 5:09 pm

Folks,

My Service Manual spec's only 10 amps for a 12v generator (page 5E-1).
I have rarely gotten more than 12.

23 sounds like a 6v spec, although my book says only 15 amps, or 20 for the fan-cooled assembly.

....Cotten

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Re: 12v Generator Model 65

#5

Post by awander » Thu Jul 19, 2012 6:18 pm

Cotten:

I am pretty sure the current "specs" on the generators are for use when you are testing them, with fully excited coils. The theory being, if you get at least that much current out of the generator under test, it is good.

Nothing says that the generator can't put out MORE current than that.....

Though I would expect the connections to the commutator to start coming apart if run for long at 23A.....

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Re: 12v Generator Model 65

#6

Post by james » Thu Jul 19, 2012 6:36 pm

Go over your basics, connections, grounds.
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Re: 12v Generator Model 65

#7

Post by panhead_kicker » Fri Jul 20, 2012 4:36 am

john HD wrote:sounds like the field terminal is grounded.

john
Correct! It was grounded momentarily as I performed the generator output test per service manual page 5E-1.
The manual simply states that if the generator doesn't produce 10 amps or more, then the regulator or wiring is at fault. The generator seemingly passing this output test is what led me to investigate the regulator and find the unsoldered terminal. But I too wondered if over 20 amps is normally possible during this test. I guess what you're saying is that I need to check for a ground condition at the regulator Field terminal when its all hooked up correctly? I don't recall the exact voltage at the battery while charging, but I would have remembered if it was much above 14 volts.

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