Rebuild your own alternator? - Page 3 - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #31 of 38 (permalink) Old Oct 7th, 10, 8:23 PM Thread Starter
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Tom Terrific II
 
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Re: Rebuild your own alternator?

Wrist is pretty well healed over. been almost a month.

starters require a lathe to turn the commutator if it's worn at all. I'd do a starter if it didn't have a lot of miles on it and something went wrong.

Alternator still working good.

Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.
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post #32 of 38 (permalink) Old Feb 4th, 12, 12:22 PM
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Bill
 
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Re: Rebuild your own alternator?

Tom, I'd like to mention a couple of points just for the sake of clarity. In your very excellent pictorial you mentioned "diode trio" several times while picturing both the diode trio and what is called the "rectifier bridge". The first picture is the rectifier bridge and the second picture is the diode trio.



The alternator produces alternating current but the car battery only "sees" direct current. In concert, the diode trio and the rectifier bridge convert the alternating current from the alternator into direct current and send it to the battery. Additionally the rectifier bridge is a heat sink and the alternator fan is critical to helping the rectifier bridge rid itself of its heat from the alternating current/direct current diode work.

Specifically the rectifier bridge is the part that converts the alternating current to direct current. The diode trio provides direct field current to the voltage regulator.


Within the rectifier bridge are 6 diodes. Three forward polarized and three reverse polarized . The reverse polarized diodes block the negativly polarized current pulses and the forward polarized diodes pass the positively polarized (direct) current to the battery.


The old school generators made direct current which the battery saw and as such didn't need diodes.
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Last edited by charbilly2001; Feb 4th, 12 at 1:23 PM.
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post #33 of 38 (permalink) Old Feb 23rd, 13, 9:08 PM Thread Starter
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Re: Rebuild your own alternator?

Bill, the 10SI alt on my 57 pickup died the other day. I tore it down, couldn't see anything wrong with it. I had a new bridge and trio left over from something, I installed them and it works again.

I tore the bridge apart, broke the super brittle plastic frame gizmo doing it. Found the center diode on one side was out. The alt was completely dead, no output whatever. Is that right? Should have put out something with only one diode out, right?

Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.
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post #34 of 38 (permalink) Old Oct 18th, 14, 6:23 PM
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stan
 
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Re: Rebuild your own alternator?

Where can I find a kit to convert my 10SI into a 100amp alt?

1969 Chevelle 300 454! finally, 29-3200 stall, TH400 and moser 12 bolt 3.73 gears.
2011 Chevy Colorado crew cab 5.3L ZQ8 black on black
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post #35 of 38 (permalink) Old Oct 19th, 14, 1:52 PM Thread Starter
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Re: Rebuild your own alternator?

Hi Stan

Sorry for slow, I haven't been at the computer much last couple days.

I'd use google for that. It'll bring up a bunch of stuff, you can pick a vendor you feel comfortable with. Amazon often has the best prices for stuff if it's listed.

If you're going to use a 100A alt be sure the charging circuit wiring is in good shape. The big wire on the back of the alt is the one that carries all the charge current. Make sure you know where it goes and the terminals on both ends are in good shape. Where it attaches to the car wiring harness varies depending model and year, there's diagrams available on the web, probably one here.

Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.
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post #36 of 38 (permalink) Old Oct 19th, 14, 3:58 PM
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stan
 
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Re: Rebuild your own alternator?

Quote:
Originally Posted by Tom Mobley View Post
Hi Stan

Sorry for slow, I haven't been at the computer much last couple days.

I'd use google for that. It'll bring up a bunch of stuff, you can pick a vendor you feel comfortable with. Amazon often has the best prices for stuff if it's listed.

If you're going to use a 100A alt be sure the charging circuit wiring is in good shape. The big wire on the back of the alt is the one that carries all the charge current. Make sure you know where it goes and the terminals on both ends are in good shape. Where it attaches to the car wiring harness varies depending model and year, there's diagrams available on the web, probably one here.
Hi Tom
I bought a new engine harness for my charging system. But for good measure I will check all terminals. Thank you for the tip
Stan

1969 Chevelle 300 454! finally, 29-3200 stall, TH400 and moser 12 bolt 3.73 gears.
2011 Chevy Colorado crew cab 5.3L ZQ8 black on black
ACES#7897
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post #37 of 38 (permalink) Old Jun 9th, 15, 2:15 PM
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Geoff Swanson
 
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Re: Rebuild your own alternator?

Quote:
Originally Posted by Dean View Post
GREAT THREAD Tom!
But shouldn't it be in the Tech Reference section?

I still can't wear my watch on my left arm after all this time since I shorted the band out on the alternator post.
You should ALWAYS remove your watch and wedding ring before working on ANY car, or machinery.
Those things are dangerous. There are many people walking around with burns, or worse yet, missing body parts.

I'll bet that really hurt !!!
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post #38 of 38 (permalink) Old Jun 9th, 15, 5:30 PM Thread Starter
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Tom Terrific II
 
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Re: Rebuild your own alternator?

Geoff,

Yes it did hurt, but it was 5 years ago. I can still see where it was though. Battle scar

Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.
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