Dear lord 2 new alternators toast. - Team Camaro Tech
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post #1 of 13 (permalink) Old Jun 18th, 10, 01:34 PM Thread Starter
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Dear lord 2 new alternators toast.

I had my mechanic wire up the alternator on my 67 camaro. It was a new style alternator. It didnt last two days and it stopped charging. So I took it back to him, and he swapped it out with a good used one he had laying around. It was charging, yesterday, when I picked it up. This afternoon, I jumped in it to put the hood on, and get it cleaned up for a cruise. I turned the key over, and it was dead. So at first I was thinking, this battery must be bad, because this is the 3rd time this week I have had to charge it. I swap my optima out, and it fires right up, but my alternator light is on again. I call my mechanic, and he says take the battery cable off with it running, I do that and it dies. Alternator is dead again. Something is not right. He connected the two hots together, and grounded the negative. The car still retains its original harness. Whats going on? I know it must be hooked up wrong. Can some one please point me in the right direction? Thanks Trey.

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post #2 of 13 (permalink) Old Jun 18th, 10, 01:41 PM
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Re: Dear lord 2 new alternators toast.

Make sure the alternator is grounded well. You can take a volt meter and measure between the alternator shell and the negative battery post. You should see less than a few tenths of a volt. If you see higher voltage, the alternator bracket isn't grounding the shell to the block good enough.

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post #3 of 13 (permalink) Old Jun 18th, 10, 01:51 PM Thread Starter
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Re: Dear lord 2 new alternators toast.

Quote:
Originally Posted by dnult View Post
Make sure the alternator is grounded well. You can take a volt meter and measure between the alternator shell and the negative battery post. You should see less than a few tenths of a volt. If you see higher voltage, the alternator bracket isn't grounding the shell to the block good enough.
Does it sound like it is hooked up right? Its burning them up literally over night. I drove it a half a block home, and the second alternator was toast. He seems to think its the wire that cuts it on with the key.

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post #4 of 13 (permalink) Old Jun 18th, 10, 02:15 PM
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Re: Dear lord 2 new alternators toast.

Something wrong in how its wired up me thinks
And that depends on what type of alternator.

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post #5 of 13 (permalink) Old Jun 18th, 10, 02:22 PM
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Thumbs down Re: Dear lord 2 new alternators toast.

Quote:
Originally Posted by 67goldrsss View Post
... He connected the two hots together, and grounded the negative ...
That most likely is the "something" that's not right
The aren't "two hots" on a GM alternator
Just one ...

And just what "ground" did he 'ground'

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post #6 of 13 (permalink) Old Jun 18th, 10, 02:22 PM Thread Starter
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Re: Dear lord 2 new alternators toast.

Quote:
Originally Posted by Steptoe View Post
Something wrong in how its wired up me thinks
And that depends on what type of alternator.
Its a new style ribbed belt alternator. It has 3 wires. There is a red and black coming out of one end of the plug, and there is a nut another red wire hooked to that.

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post #7 of 13 (permalink) Old Jun 18th, 10, 02:24 PM Thread Starter
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Re: Dear lord 2 new alternators toast.

Quote:
Originally Posted by Vintage 68 View Post
That most likely is the "something" that's not right
The aren't "two hots" on a GM alternator
Just one ...

And just what "ground" did he 'ground'
So which one is needed? The one in the plug or the one that has a eye end and connected by a nut to the back of the alternator?

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post #8 of 13 (permalink) Old Jun 18th, 10, 03:31 PM
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Re: Dear lord 2 new alternators toast.

The 'black' (#1 terminal on the alt.) is not a ground
It's the field ...

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The 'common' "hot" connection is the junction block near your battery so the alternator remote senses the actual system voltage and regulates the output of the system to the correct voltage.

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post #9 of 13 (permalink) Old Jun 18th, 10, 05:38 PM
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Re: Dear lord 2 new alternators toast.

Quote:
Originally Posted by 67goldrsss View Post
So which one is needed? The one in the plug or the one that has a eye end and connected by a nut to the back of the alternator?

You need to find out if it's a one wire or a three wire alternator. It is typical to turn a three wire into a one wire by connecting the field wire to the lug on the back. A one wire alt still has the plug for this but the connection is inside the alternator. Connecting the field and lug pin on a one wire doesn't hurt anything but it doesn't do anything either.

What is most likely killing them is that the wire he is "grounding" is the output lead for a voltage gauge. The alternator grounds through the engine block or ground strap attached to the alt bracket.

Also, are you using a voltage regulator? I assume it has been removed if you're running a later model internally regulated alternator.

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post #10 of 13 (permalink) Old Jun 18th, 10, 06:22 PM Thread Starter
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Re: Dear lord 2 new alternators toast.

Quote:
Originally Posted by Vintage 68 View Post
The 'black' (#1 terminal on the alt.) is not a ground
It's the field ...

Attachment 16379
Thank you for the diagram. I am going to print this off.
The 'common' "hot" connection is the junction block near your battery so the alternator remote senses the actual system voltage and regulates the output of the system to the correct voltage.
Quote:
Originally Posted by Steiner View Post
You need to find out if it's a one wire or a three wire alternator. It is typical to turn a three wire into a one wire by connecting the field wire to the lug on the back. A one wire alt still has the plug for this but the connection is inside the alternator. Connecting the field and lug pin on a one wire doesn't hurt anything but it doesn't do anything either.

What is most likely killing them is that the wire he is "grounding" is the output lead for a voltage gauge. The alternator grounds through the engine block or ground strap attached to the alt bracket.

Also, are you using a voltage regulator? I assume it has been removed if you're running a later model internally regulated alternator.
It is a three wire alternator. I am positive. I am using the voltage regulator as well.

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post #11 of 13 (permalink) Old Jun 18th, 10, 06:33 PM
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Re: Dear lord 2 new alternators toast.

If using an internal regulated alternator, 10SI or an 12SI, the external regulator comes out of the circuit.
Unplug the external reg and on the external plug you just unplugged, connect/jumper the two outside terminals to each other and jumper the two inside terminals of the ext reg plug.

At the alternator, the large ring terminal goes to the BAT stud, and you can buy an adapter to plug in the existing 10DN connector, looks like this 'll', to the internal reg alt, 10SI or 12SI looks like this '--'.

Now, with the new alt running, if it is working, the case should feel warm to the touch. If it is hot, some circuit elsewhere is drawing alot of power/current. With a temp gun, case temp should not be over 130F.

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post #12 of 13 (permalink) Old Jun 18th, 10, 11:16 PM
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Re: Dear lord 2 new alternators toast.

All I had to do with mine to set up was the main Batt red stays the same
The ign the same and a small jumper from the ign terminal to the feild...
Been like that for 25 yrs.

My Spelling is not incorrect...it is creative

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post #13 of 13 (permalink) Old Jun 19th, 10, 01:35 PM
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Re: Dear lord 2 new alternators toast.

This is what I was told to do and my alternator works fine now

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