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Old 02-12-2018, 03:47 PM   #16
FDChappie
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Default Re: Alternator problem 10si

Yes a good battery will be almost impossible to push to 15.5v. It will take a couple of hours or more to top off a lead acid battery, particularly if it is sulfated from being discharged for more than a few days. I'd bring it to an auto parts store and have it tested.
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Old 02-15-2018, 11:41 AM   #17
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Default Re: Alternator problem 10si

this weekend, I will be doing lots of electrical checking. I will report back after the weekend. Thanks for the input guys.
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Old 02-20-2018, 01:23 PM   #18
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Default Re: Alternator problem 10si

FRICK!

OK- charged the battery overnight. Had 12.6 volts @ cold. Started her up. Alternator still cranking out 15+ volts (sometimes 16+). I am going to swap out the alternator to see of that will change things.

also, spent almost the entire weekend checking all light grounds on the Scout. I checked ALL marker lights, turn signal lights, headlights, tail lights (and their related grounds). All grounds now have dielectric grease. I am getting a serious drop on volts when I turn the directional signals on (as well as the emergency flasher). when scout is at idle (600 rpm) and the flasher is on, all lights "dim" each time the flasher cycles. Onward with more checking, but it is really bothering me. GREMLINS!

I do have a ground strap from frame to engine to body. Any ideas, anyone?
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Old 02-20-2018, 01:26 PM   #19
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Default Re: Alternator problem 10si

just one more question:


the "tickler" one strand wire from the alternator. Help this old man understand why it is to have it. thanks
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Old 02-20-2018, 01:52 PM   #20
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Default Re: Alternator problem 10si

Here is a good wiring diagram.
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Old 02-20-2018, 01:54 PM   #21
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Default Re: Alternator problem 10si

Also at 500 rpm engine speed a 37 amp 10si puts out a rated 12a the 61 amp puts out 8a. That's a 50% difference. At 650 rpm the output is the same.
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Old 02-20-2018, 01:56 PM   #22
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Default Re: Alternator problem 10si

These articles helped me immensely when I went to a 100 amp alternator in my 75 Scout. Sounds like you probably have a problem with the voltage regulator in your alternator, 16 volts can fry your battery. Pay special attention to the "remote sensing" section in the second article.
http://www.madelectrical.com/electri...hreewire.shtml
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Old 03-17-2018, 06:41 AM   #23
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Thumbs up Re: Alternator problem 10si

Well:

swapped out the alternator, that was the problem. Everything is good. At 650 (idle) got 13+ volts at battery. At any speed above that, 14.5 (or a little more) . Good deal. I am a happy person now. Thanks all for the input. Next project: the starter and rebuild/remote wiring.
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Old 03-18-2018, 08:46 AM   #24
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Default Re: Alternator problem 10si

Thanks for updating.
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