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Tractor Talk Discussion Forum

Follow up om 10SI Delco alternator problem post.

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Gene Davis (Ga.

01-19-2008 19:05:45




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solved the problem today. Took it back apart and replaced the insulatrd screw near the outer edge with a non insulated one. That solved the problem. Thanks guys!




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Gene Davis (Ga.)

01-20-2008 18:23:44




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 Re: Follow up om 10SI Delco alternator problem post. in reply to Gene Davis (Ga.), 01-19-2008 19:05:45  
Jon. Yes it was your tip that got me thinking. I had disassebled another alternator and tried the regulator out of it and when assembling this one,I obviously picked up one too many insulated screws. The regulator from this one fell apart in my hand when I took it apart and thats why I tried the other regulator out of the other alternator and it was evidently good, but apparently I got the screws wrong. This alternator has a small ceramic looking wire wound resistor or what ever from the post where the diode trio is connected over to the post with the uninsulated screw but the other alternator does not. Any idea on this? it is a 63 amp alternator. I took an ohm reading across the posts on the new one and it read 36.9 and the one that came apart read 0 and the other used one I took out of the alternator that I had apart and it read 9 ohms and another used one I had read the same as the new one 36.9. Is there anything to be learned from these numbers?

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jon Hagen

01-21-2008 07:35:55




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 Re: Follow up om 10SI Delco alternator problem post. in reply to Gene Davis (Ga.), 01-20-2008 18:23:44  
I also have found a few junkyard cores with the little wire wound resistor. I really dont know what application would require that part or what it does, they seem to work with or without it ?
Bob seems to have a lot of experience with that model alternator, Bob, can you que us in as to what that little resistor does and what machines use it. ??
I also have uesd an ohmmeter on used regulators with readings that vary a lot. They all seem to work within normal voltage specs, so I suspect that different brand regulators are built to different specs.

Testing a used regulator is not hard if you have access to a variable voltage power supply that can supply atleast 16 volts. You connect the + terminal of the power supply to the two regulator blade connctions and the - terminal to that ourboard screw hole where the un insulated screw goes, and connect a 12V test light across the other two terminals. When you apply voltage, the test light should glow until the voltage exceeds 14-15 V where the light will go out. As soon as you lower the voltage below that 14-15 V again the light should come back on. This indicates a working regulator that is within normal specs.

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Jon Hagen

01-19-2008 21:11:33




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 Re: Follow up om 10SI Delco alternator problem post. in reply to Gene Davis (Ga.), 01-19-2008 19:05:45  
Good deal Gene,
I posted that tip because I did that exact thing on the first Delco 10SI I ever worked on, maybe 30 years ago. The frustration of having to disassemble that alternator 2-3 times untill I found the misplaced screw, has remained with me for all that time and maybe another 50 10SI alternator repairs. :-)



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