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03-16-2018, 11:18 PM | #1 |
Registered User
Join Date: Jan 2004
Location: Wyoming
Posts: 641
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Si alternator conversion wiring
I recently purchased an adapter to “plug and play” the si alternator from the external alternator wiring. After much research on the site I have seen the illustration showing jump wires connecting the white and brown wire, as well as the blue and red wires jumped together. This leaves the white and blue wire to be attached, white to the #1 terminal on the alternator and blue to the # 2 terminal of the alternator.
Unfortunately, my sealed( not visible ) manufactured jump block does not allow me to see if this is in fact how the wires interface. The pigtail supplied with the kit has the blue wire on the # 1 terminal and the white wire on the # 2 terminal. Concerned , should I be? |
03-16-2018, 11:37 PM | #2 |
Senior Member
Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,563
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Re: Si alternator conversion wiring
I bought my plug and play adapters and just plugged them in. It works. If you are concerned, there's nothing wrong with being cautious. You can check with a multimeter what the internal connections are on the sealed jump block. Just check for continuity on the terminals of the block.
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03-16-2018, 11:48 PM | #3 |
Registered User
Join Date: Jan 2004
Location: Wyoming
Posts: 641
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Re: Si alternator conversion wiring
dmj,
Thanks for the quick response. If I have power going in one it should be comin out the other so to speak. Makes sense. Thanks |
03-17-2018, 12:39 PM | #4 |
Msgt USAF Ret
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,703
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Re: Si alternator conversion wiring
It's very easy to check. The wire to no. 1 will have 12 volts on it with the key on and zero volts with the key off.
The no. 2 wire will be constant 12 volts. Some folks jump the blue and brown wire and the red and white wire. This causes confusion but it really doesn't matter as long as the brown wire is jumped to no. 1. If you plug it in and the wires are wrong it won't damage anything but it will drain the battery overnight. It may cause the engine not to shut off when the ignition is turned off.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
03-21-2018, 06:28 AM | #5 |
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Join Date: Aug 2015
Location: mi
Posts: 45
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Re: Si alternator conversion wiring
I want to do the same thing, what year of alternator did you ask for and where did you get the plug from? thanks
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03-21-2018, 12:27 PM | #6 | |
Msgt USAF Ret
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,703
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Re: Si alternator conversion wiring
Quote:
Pictures. You'll need these. Adapter plug for the alternator, $5.00 at the autoparts store. The alternator with the simple instructions. You might also want to upgrade the output wire from the alternator to a 10 gauge or even an 8 gauge wire if you plan on having electric cooling fans, a stereo amp. or other high draw components.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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03-21-2018, 01:06 PM | #7 |
Msgt USAF Ret
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,703
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Re: Si alternator conversion wiring
Here is a much better setup that will upgrade the electrical charging system on any of our trucks.
Much better main junction. Upgraded wiring Voltmeter Better fusing Not shown is a ground from the battery to the engine block.
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VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
03-21-2018, 08:01 PM | #8 | |
Senior Member
Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,563
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Re: Si alternator conversion wiring
Quote:
My alternator is a new clone 12SI from eBay https://www.ebay.com/itm/171668075747 Info page I have bookmarked http://www.madelectrical.com/electri...elcoremy.shtml I don't have any high-powered items that I'm adding such as electric fans, so I have not upgraded the output wiring. |
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