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Old 04-30-2011, 04:58 AM
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Alternator - Converting 1 to 3 wire

Howdy,

Question:
Can someone please tell me how to convert my existing 1 wire alternator schematic to a 3 wire system?

(I've already followed several old threads that keep leading me to
MadElectrical.com. BUT the site isn't working now. Need some other source for good info.)


Details:

I currently have a 3 wire alternator that has been rigged to function as a 1 wire system. This was fine until I upgraded to electric fans, as the car was overheating in the hot Texas summers.

When the fans kick in, the electric draw seems to be too much for the 1 wire alternator system...and the battery keeps dying.

I have no other explanation for the battery dying. I've gone over the fan wiring (no grounding and no battery draining until fans kick in). I've replaced the battery (twice actually). And I've had my 105A alternator tested at 3 different places and always good.

So, my only conclusion is that my 3 wire alternator is not able to adequately adjust the charge when the fans kick in during low RPM city driving.

I would really appreciate any help.
Thanks!

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Old 04-30-2011, 09:34 AM
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Hi
Welcome to Hotrodders.com Glad to have you with us
Rich

http://t1.gstatic.com/images?q=tbn:A...TZfHBtCg9iQF-Q
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Old 04-30-2011, 10:25 AM
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Quote:
Originally Posted by richard stewart 3rd
Hi
Welcome to Hotrodders.com Glad to have you with us
Rich

http://t1.gstatic.com/images?q=tbn:A...TZfHBtCg9iQF-Q

Well you're in the right place.
Im sure someone will have the answer for you.
You mentioned that you have a good 105 amp alternator. Thats a good start.
What do your fans draw (amps) when they are running ??? Hopefully less than a 105. (more than 105) you have your answer..........If less, do they run after you shut down your car ??? What else draws down your battery ??? Big stereo???
With some of this info Im sure someone will have some Ideas
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Old 04-30-2011, 11:56 AM
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Hi
I put that diagram there so you would be able to wire your alternator back the way it should be wired, it will work correctly then, charging at idle instead of just spinning. Look around the alternator the original three wires may still be there, that would make putting it back correctly much simpler.
Rich
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Old 05-01-2011, 04:45 PM
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Links work for me>> http://www.madelectrical.com/electrical-tech.shtml
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Old 05-04-2011, 06:03 PM
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Here's what I used to convert from an ext to a internal alt, should work for what you need
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Old 05-05-2011, 10:48 AM
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Quote:
Originally Posted by 420Lump
(I've already followed several old threads that keep leading me to
MadElectrical.com. BUT the site isn't working now. Need some other source for good info.)
i used and referred the madelectric.com site for years and assumed it had gone off the air
i have tried to access his site with 4 computers, iexplorer and google chrome, winXP & win7 and cannot get it to load.
i wanted to order some materials off his site 2 yrs ago and have not been able to see it since.
but then i read it is still up and people are still using it.

a recent article in hotrod magazine also referred to mark hamilton and his site madelectrical.com
alas i still cannot see his site, maybe he made a change to his site or blocked earthlink.net from viewing his site.

i build my own computers and consider myself well versed in windows and windows trouble shooting
still cannot see his site, bummer...
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Old 05-05-2011, 03:02 PM
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The link worked for me
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Old 05-08-2011, 07:59 PM
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Many thanks to all who replied!

Funny enough, I could not get madelectric to work on my computer...but it works on my smartphone. I don't understand that at all??

I'll try wiring using schematics everyone sent, in conjunction with the madelectric info. It's gotta be the solution. There don't seem to be any other factors in play. The electric fans come from a stock early-2000's Ford contour, which surely can't overdraw a 105A alternator. The alternator works. No other recent electric work. I wired the fans to a thermostat. And, they cut off when the ignition is off. So...this has just got to work. Will keep y'all posted how it turns out.

Steve
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Old 05-08-2011, 09:43 PM
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Hi
You had better check the amperage needed for those fans, my sable has a 130A alternator & you can tell when the fans come on by the load put on the alternator causing the engine slow some.
Rich
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