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12-31-2024, 10:20 AM | #26 | |
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Re: Wiring in a larger alternator
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Follow up... I just learned the difference between a 10si and a 10dn...i have a 10dn with a 3 wire hook up... So there is that. Doesn't change the fact it is putting out AC and DC voltage indicating a bad diode(s). Learned more... My alternator has connections on the top (10si) and not the back (10dn) so further digging is needed on my part to see of someone else did or half did a conversation *shrugs* Last edited by Kalums; 12-31-2024 at 11:17 AM. Reason: Learned more... |
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12-31-2024, 01:06 PM | #27 |
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Re: Wiring in a larger alternator
There are a couple of really easy checks you can do, called out in the factory service manual (available free on this forum) One is using the grounding tab provided in the back of the 10-SI to eliminate the voltage regulator after you have your test meter hooked up correctly. The diode check is called out in the manual with nice pretty little pictures too. It shows you exactly where to put the leads of the meter.
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12-31-2024, 01:26 PM | #28 | |
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Re: Wiring in a larger alternator
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01-01-2025, 12:45 AM | #29 |
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Re: Wiring in a larger alternator
Some aftermarket 10dn alternators have the plug on top instead of the back such as those made by Tuff Stuff. The question is, does it use a plug that has prongs like "| |" or "- -" The vertical ones are 10dn, the horizontal ones are 10si.
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01-01-2025, 01:06 AM | #30 |
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Re: Wiring in a larger alternator
It looks older, but they are vertical (10dn). So after testing per the service manual... I'm still getting an output of AC and DC voltage up to the regulator on the radiator support... But testing the "output" from the regulator to the rest truck is DC... BUT there is a significant voltage and amperage drop from the regulator at idle. It picks up to normal when truck is revved to 1200+ rpm on the engine... *shrugs* at this point I'm tempted to replace the alternator with a 10si or 12si and do the conversion/new wiring. I think that will benefit me most in the long run.
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01-01-2025, 12:15 PM | #31 |
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Re: Wiring in a larger alternator
So... Found something else interesting while poking around in/with the wires from my alternator to the battery is "solid" (think house wire/ Romex) not sure if that has anything to do with anything... But this just keeps getting stranger as I go along.
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01-01-2025, 12:30 PM | #32 |
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Re: Wiring in a larger alternator
Now we've got to see pictures...
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01-01-2025, 12:34 PM | #33 |
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Re: Wiring in a larger alternator
>>I'm still getting an output of AC and DC voltage up to the regulator<<
How much AC are you actually getting ? Unless you actually know what is going on, don't over think this AC idea. The first image shows the 3-phase voltage as produced in the stator windings. The diodes chop off the Negative side and you end up with a 12 volt ripple as displayed in (A) in the second image. The wire resistance and the battery itself will filter and smooth out that ripple and your meter will see a 12 volt DC voltage. Another thing to consider is the relay voltage regulation provided by the mechanical voltage regulator. The relay contacts in the upper-right side of the relay image can only supply the Field windings with 0 volts or 12 volts. The upper contact is Ground and the lower contact is 12 V. The center contact is rapidly fluctuation up and down, constantly turning the Field winding ON/OFF. This could actually be seen as a AC signal, but at a much higher frequency than the 3-phase signal. Don't expect the 10DN output to be ripple free. The battery doesn't care, neither should you.
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01-01-2025, 01:01 PM | #34 |
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Re: Wiring in a larger alternator
Wish granted, the "coil" is what I pulled out of the truck... It went from the driver's side of the engine to the fender well and around the front over the radiator and then there was some coiled up under/behind the battery tray (or what is left of it). The second is outside next to the truck, I bent the tip back out/around, still has dielectric grease on it... Lighting in my garage is terrible. P sry for the garbage pictures.
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01-01-2025, 01:07 PM | #35 |
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Re: Wiring in a larger alternator
Interesting. I don't know what kind of wire that is. The insulation looks kind of too thick for romex.
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01-01-2025, 01:07 PM | #36 | |
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Re: Wiring in a larger alternator
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01-01-2025, 01:10 PM | #37 |
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Re: Wiring in a larger alternator
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01-01-2025, 01:43 PM | #38 |
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Re: Wiring in a larger alternator
I swapped a 10SI into my K20 close to 10 years ago and never looked back. I had a couple new external regulators that crapped out on me in short order so I upgraded. I’ve never had a problem with charging or anything like that, but electrically my truck is mostly stock. The wiring changes to go from a DN to a 10/12SI are really really small and simple. I’d bet someone hooked up the plug at the alternator backward at some point or another on yours, if that happens it will cause the alternator to go to full output and burn that wire over the radiator up. I’ve seen it a few times on these trucks.
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Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne: 5” lift, 35’s, front dana 60 blah blah blah… http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB: 4” lift 33”s… in a million pieces http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 35x12.5x20’s Last edited by 57taskforce; 01-01-2025 at 01:49 PM. |
01-01-2025, 01:53 PM | #39 | |
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Re: Wiring in a larger alternator
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