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Old March 6th, 2006, 08:26 PM   #1
BigBlkYJ 355
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Alternator Wiring

Bought a new alternator for the SBC swap, and ive noticed that aside from the main pos. post there are 2 smaller blade type connections on the alternator. Im assuming something to do with the voltage regulator...? Im not too fimiliar with the chevy stuff, so do i need to hook these to anything, or can i just leave them the way they are and use the main post back to the battery?
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Old March 7th, 2006, 07:24 AM   #2
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did you get the plug that comes off the two blades? if so it should have a pink & brown wire, the pink goes to battery power and the brown is a switched to ground, but it has to go threw a bulb before it makes ground.
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Old March 7th, 2006, 03:52 PM   #3
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Quote:
Originally Posted by Yetti
did you get the plug that comes off the two blades? if so it should have a pink & brown wire, the pink goes to battery power and the brown is a switched to ground, but it has to go threw a bulb before it makes ground.

No it didn't come with a plug. So the pink and the main post go to battery + and the brown goes to a bulb then from the other side of the bulb goes to ground? What exactly is that for? Im assuming the switch can be a relay instead, that just turns the bulb on and off with the ign. key?
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Old March 7th, 2006, 05:33 PM   #4
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no. the key is to turn the ground on & off, the bulb is the fuse in the system. if the bulb glows the alt in not working. in effect its an idiot light.
the blub should be off when the engine is running.
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Old March 7th, 2006, 08:45 PM   #5
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so... like this

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Old March 8th, 2006, 07:02 AM   #6
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yep, just add a switch to the ground circut
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Old March 8th, 2006, 03:31 PM   #7
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so what is the switch actually for? Just turn it on when the vehicle is running?
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Old March 8th, 2006, 04:43 PM   #8
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The switch would actually be part of your ignition switch.
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Old March 8th, 2006, 05:03 PM   #9
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so y can't i just put a relay in there that comes on when the ignition switch is on, like i said before? If i had the contacts where the switch would be and a hot run from the key to the relay, what would be the difference?
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Old March 8th, 2006, 05:47 PM   #10
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I suppose you can run a relay, it shouldn't matter what the switch is. as long as it can turn the ground off.
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Old March 8th, 2006, 08:34 PM   #11
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i guess i dont understand what that whole setup is for? Is the ground suppose to be connected while the engine is running, then disconnected when its off? Or the other way around. Sorry i know i sound completely dumb but im usually real good with automotive wiring, i just cant grasp what this lightbulb circuit is for...
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Old March 8th, 2006, 09:03 PM   #12
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ok sorry for the above dumb post, but i did some research further into it, and i get now why the light was needed. It seems that the alt. will not start to charge until a load is placed on that terminal for a second, or the throttle goes up. So i guess i will just use the old 4X4 light, which is already in the dash as that light haha. The websites that i read said to run a switch like u said to a 12V power source not ground though?
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Old March 11th, 2006, 08:35 PM   #13
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Quote:
The websites that i read said to run a switch like u said to a 12V power source not ground though?
I guess thats part true. the real old ones from about `70- through to about `86-87 used the positive wire. the new ones use the ground. even the positive side one have to go threw a bulb to make it work right.
if you case on the alt have reversed headed torx bolts its a new style. if its the old style it has 4 hex head 5/16"
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