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Old 03-07-2011, 01:54 PM
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Alternator Question


Can anyone tell me what these two prongs are for on the GM Alt? The reason I ask this is because I am replacing a Hayden Eletric fan controller/probe and I'm hooking it back up the way it was and the one (yellow) wire went to the top tab of the alternator. The controller is not working and I called the company and read the directions and that yellow wire needs to go to a wire that is "hot" when the ignition is "on" Well even with the car running there is no power comiing from that top tab.. Should there be? the Tech guy from Hayden says that weird that it was hooked up that way but is was working that way for many years. Also i don't have any other options because I only have two other wires to conect into and they are "hot" all the time even with the key off.

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Old 03-07-2011, 02:09 PM
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Is this a stock three wire alternator or an aftermarket one-wire alternator? If a one-wire, you aren't supposed to connect anything to those prongs.
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Old 03-07-2011, 02:29 PM
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Quote:
Originally Posted by joe_padavano
Is this a stock three wire alternator or an aftermarket one-wire alternator? If a one-wire, you aren't supposed to connect anything to those prongs.
There is a plug that goes in there I have it out for the picture. There is a orange wire (hot even with the ignition off) that goes to the lower prong a yellow wire that goes to the eletric fan and the "Batt" wire goes up the the the stud on the alternator (shown in picture) other then that there isn't really anything else other then a wire going to the AC compresser. I need to know if there should be a current coming from the top prong. At this time there isn't and thats why my thermistat for the eletric fan is not working. thanks for your reply!
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Old 03-07-2011, 05:00 PM
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Terminal 1 (blue wire) should be for your idiot light which serves as the igniter wire for the alt to start putting out current, Terminal 2 (White wire) should be for a constant 12v source such as your battery
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Old 03-07-2011, 05:38 PM
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It would appear that the idea is to power this from the Field circuit of the alternator. I would suggest you use a different circuit that's 12 VDC switched. Otherwise, it's the #2 terminal, white wire IIRC.
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Old 03-07-2011, 06:38 PM
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I assume you are running the fan(s) via a thermal switch.... in that case you could run the wire from the fans straight from the battery lug on the rear of the alt and not use the terminal 1 or 2. My recomendation would be run it from the radiator support junction block (near the battery) instead of directly from the alt.
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Old 03-07-2011, 07:02 PM
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It would also be a good idea to use relay(s) where appropiate.
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Old 03-07-2011, 07:19 PM
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THats your built in regulter 1 wires the battery the others the field you can "t" off the battery one with no problem (color code usualy red or orange 10 gauge wire!) relays a good idea
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Old 03-07-2011, 07:47 PM
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That's a Delco 10DN, I do believe- externally regulated.
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Old 03-07-2011, 08:23 PM
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Quote:
Originally Posted by painted jester
Thats your built in regulater 1 wires is the battery the others the ignition ( It enegizes your regulater when keys turned on) you can "t" off the battery one with no problem (Battery color code usualy red or orange 10 gauge wire!) relays a good idea
I changed the wording of this post (sorry for the mistake) but you can also "t" the main post not in picture!
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Old 03-07-2011, 08:25 PM
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External regulated posts are paralell these are in line you can see the white regulator inside! It looked like that to me at first too

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Old 03-08-2011, 03:57 AM
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10SI looks like to me
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Old 03-08-2011, 04:46 AM
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Shows what I know. Had it in my head that he had an early '60's Chevy.
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Old 03-08-2011, 04:00 PM
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Probably was switched over at some point, Mine's a 67....I recently switched over to internal reg...... best thing I've done to the elec system.... lights are bright now etc....
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