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Perplexing alternator problem

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Greg1959
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PostPosted: Wed May 08, 2013 10:42 am    Post subject: Perplexing alternator problem Reply to specific post Reply with quote

Ford 860. NAPA 10SI alternator quit charging. Replaced with new on 10SI (213-4011). Started motor and no charge. Amp gauge shows discharge when lights are turned on. Also, amp gauge shows a little jump towards (+) 3 times and does not try again until I shut down motor and disconnect battery. Installed new diode(1N4003), silver line towards alternator, just in case old one went bad. Same problems persists. #1 spade goes to diode then on up to terminal block. #2 spade goes to battery post on back of alternator.

I wired it using john in la "hundred series 12 volt conversion" instructions. Everything worked until this problem showed up.
 
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old
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PostPosted: Wed May 08, 2013 11:00 am    Post subject: Re: Perplexing alternator problem Reply to specific post Reply with quote

Try this. It would be sort of like jump starting the alternator. Run a wire from the + side of the battery to the diode the side that is hooked to the alternator. If it charges then you have a problem with you wire or diode. If it does not try the magnet test and see if you lay say a small nut on the center bushing area of the alternator if it sticks. If it does not stick it is not exciting so you may have a new bad alternator.
 
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souNdguy
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PostPosted: Wed May 08, 2013 11:06 am    Post subject: Re: Perplexing alternator problem Reply to specific post Reply with quote

#1 thru diode to switched side of key.

maybee your ammeter is bad.

have you checked with a volt meter?


got battery installed negative ground?
 
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Greg1959
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PostPosted: Wed May 08, 2013 11:41 am    Post subject: Re: Perplexing alternator problem Reply to specific post Reply with quote

: Run a wire from the + side of the battery to the diode the side that is hooked to the alternator. If it charges then you have a problem with you wire or diode."

Ran jumper...no charge.


"If it does not try the magnet test and see if you lay say a small nut on the center bushing area of the alternator if it sticks. If it does not stick it is not exciting so you may have a new bad alternator."

Nut- Does not stick.

Thanks
 
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Greg1959
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PostPosted: Wed May 08, 2013 11:45 am    Post subject: Re: Perplexing alternator problem Reply to specific post Reply with quote

#1 thru diode to switched side of key.- yes

maybee your ammeter is bad.- I figured if it could show a discharge the it should be able to read when charging

have you checked with a volt meter? -Alternator, yes output at 1300rpm is 0.90 volts


got battery installed negative ground? -yes
 
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jstpa
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PostPosted: Wed May 08, 2013 12:00 pm    Post subject: Re: Perplexing alternator problem Reply to specific post Reply with quote

If your voltmeter is only reading .90 volts at the back of the alternator then your battery connection to the alternator has been lost. If its reading .90 higher than battery voltage with it running then I miss understood. jstpa
 
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JMOR
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PostPosted: Wed May 08, 2013 12:03 pm    Post subject: Re: Perplexing alternator problem Reply to specific post Reply with quote

....and further more, since those 10SI units used so many different regulator designs from different suppliers & over the many years, you never know what the output will do with battery disconnected. Some will run wide open, while others will yield no output.
 
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Greg1959
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PostPosted: Wed May 08, 2013 12:11 pm    Post subject: Re: Perplexing alternator problem Reply to specific post Reply with quote

I disconnected the battery line to see if alternator would produce charge. Sorry I did not clarify that.
 
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PostPosted: Wed May 08, 2013 12:16 pm    Post subject: Re: Perplexing alternator problem Reply to specific post Reply with quote

Greg1959 wrote:
(quoted from post at 16:11:32 05/08/13) I disconnected the battery line to see if alternator would produce charge. Sorry I did not clarify that.
......which may have killed it, if it was previously good alt. These alts can produce over a hundred volts when receiving full field and no or even moderate loads. Should never be run with battery disconnected.
 
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Greg1959
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PostPosted: Wed May 08, 2013 12:31 pm    Post subject: Re: Perplexing alternator problem Reply to specific post Reply with quote

What is a 'safe' way of checking one? If I need to do so in the future. BTW, I had called NAPA when this all started and asked if they had a way to test the alternator. Their response was "No, that machine has been broken for years."
 
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PostPosted: Wed May 08, 2013 1:06 pm    Post subject: Re: Perplexing alternator problem Reply to specific post Reply with quote

Greg1959 wrote:
(quoted from post at 16:31:36 05/08/13) What is a 'safe' way of checking one? If I need to do so in the future. BTW, I had called NAPA when this all started and asked if they had a way to test the alternator. Their response was "No, that machine has been broken for years."
Find another parts supplier. You can connect a voltmeter directly across the battery. If vehicle hasn't been run recently, the voltage will be approximately 12.3 volts. Then you start it, run at speed for a few minutes as you watch the voltage on your voltmeter climb a volt or more. No climb = no alternator output.
 
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Greg1959
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PostPosted: Wed May 08, 2013 1:13 pm    Post subject: Re: Perplexing alternator problem Reply to specific post Reply with quote

I did that at the onset of problem. Voltage read 12.38 from battery without tractor running. After starting, checked voltage at battery post on alternator. Still read 12.38 volts.
 
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JMOR
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PostPosted: Wed May 08, 2013 1:23 pm    Post subject: Re: Perplexing alternator problem Reply to specific post Reply with quote

Greg1959 wrote:
(quoted from post at 17:13:48 05/08/13) I did that at the onset of problem. Voltage read 12.38 from battery without tractor running. After starting, checked voltage at battery post on alternator. Still read 12.38 volts.
No climb = no alternator output. Alt not working.
You can do another test, but unless you are just curious or want to dig into the alt internals, it isn't worth much. It tells you whether the problem is the VR or some other area of the alternator. On the back side of alt is a "D" shaped hole. Inside that hole is a small metal tab. When a screwdriver is inserted & touches tab, it shorts that tab to the side of the "D" hole and this will provide full field current and if all else is well the alternator will output its maximum.

 
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Greg1959
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PostPosted: Wed May 08, 2013 1:42 pm    Post subject: Re: Perplexing alternator problem Reply to specific post Reply with quote

JMOR

That's interesting information.

Thanks
 
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PostPosted: Wed May 08, 2013 1:59 pm    Post subject: Re: Perplexing alternator problem Reply to specific post Reply with quote

Sounds like you got a bad alternator right out of the box. I learned years ago to have them test them before I go out the door. Had more then one alternator and starter be bad from the get go
 
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