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Old 04-12-2012, 11:27 AM
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140 Amp alternator 1 wire or 3?

http://www.summitracing.com/parts/SUM-810350/

I got this alternator to install as a 3 wire unit. Only now I see that the wires will be a little too close to the valve cover for my liking. In the description it is says "One-Wire Capable: Yes" but in the notes "This is a 3-wire alternator."

Does that mean it's a however I hook it up (1 or 3) wire alternator or is it just a bad description and it is in fact a 3 wire?


Thank you.

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Old 04-12-2012, 11:52 AM
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Read this:

http://mightymo.org/Proj_OneWire.htm...20to%20vehicle
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Old 04-12-2012, 12:09 PM
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Will I went with it. Just the one wire. Amp meter is on my todo list.

Started it up and it is reading 13.6ish volts. As high as 13.8 and low is 13.4. Even reved it up to a little over 2000 rpm and volts stayed about the same also lights on and off.


I read the page (well ok, not all of it. Short on time right now)
Quote:
When the engine is running, the voltage should be aproximately 14.7 volts DC on a fully charged battery.
So it looks like that I am one volt off but still above 12 volts. is that ok? or something that needs to be look into more?

Thanks
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Old 04-12-2012, 07:14 PM
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14.7 volts sounds high for alternator output. Most of them are designed to charge at about 13.8-14.0 volts.

My 92 amp 12si will usually charge at about 13.8 volts when I first start the truck, and then gradually reduce to about 12.5-13.0 as the battery charges back up. Once the battery recovers from the initial starter load I don't get much variation in voltage, regardless of engine speed.

Bruce
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Old 04-13-2012, 10:31 AM
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What size wire should I get to run from the alternator to the battery?

I know the dual fans that I am installing have a max load of 50amps.
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Old 04-13-2012, 11:02 AM
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That generally depends on how far your Battery is from your Alernator-look here:

http://www.alternatorparts.com/wire_size_chart.htm
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Old 04-13-2012, 11:47 AM
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The stock alternator wire on many GM vehicles is an 8 gauge wire with a 12 gauge fusible link on the battery end, so that should be sufficient if you have the battery in the stock location.

I picked up one of the stock GM charge wires at the junkyard and it had the fusible link and 8 gauge charge wire combined with the main battery cable that runs to the starter. However, the main battery cable was too short for my truck, so I just connected the alternator charge wire to my existing battery terminal using a battery post adapter.

Bruce
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Old 04-27-2012, 12:09 PM
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Quote:
Originally Posted by 75gmck25
14.7 volts sounds high for alternator output. Most of them are designed to charge at about 13.8-14.0 volts.

My 92 amp 12si will usually charge at about 13.8 volts when I first start the truck, and then gradually reduce to about 12.5-13.0 as the battery charges back up. Once the battery recovers from the initial starter load I don't get much variation in voltage, regardless of engine speed.

Bruce

I just got everything installed and hooked up. I got a 6 gauge wire running from the Alt to the + terminal on the battery (no amp. meter). I started it up and the volt meter is showing just 12.6 - 12.8 volts. That seems low, right?

Does that mean I need to hook this up as a 3 wire alternator?


thank you.
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Old 04-27-2012, 01:23 PM
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nevermind. I put a volt meter at the battery while engine was running and I am getting 14.53 -14.54 volts. Seems to be a voltage drop where my in dash volt meter is. I'll work on that later.
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Old 05-07-2012, 08:40 PM
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Quote:
Originally Posted by Chucky5150
nevermind. I put a volt meter at the battery while engine was running and I am getting 14.53 -14.54 volts. Seems to be a voltage drop where my in dash volt meter is. I'll work on that later.
Thats why a 3 wire is supposed to have the sense wire go "far" from the battery to where you have the voltage drops so that the alt can output properly. Putting the #2 wire straight to the battery terminal renders that sensing option useless.
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