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Old 05-04-2010, 11:32 AM
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GTO SE Altenator

I have a 67 GTO with a 71 Pontiac 350. I'm replacing my altenator with a 1-wire self energizing altenator. Someone told me the 1-wire from the SE altenator goes to the starter, I don't understand how that could be right, I really think it goes direct to the positive of the battery. Am I right?

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Old 05-04-2010, 03:12 PM
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Quote:
Originally Posted by GTO Dixon
I have a 67 GTO with a 71 Pontiac 350. I'm replacing my altenator with a 1-wire self energizing altenator. Someone told me the 1-wire from the SE altenator goes to the starter, I don't understand how that could be right, I really think it goes direct to the positive of the battery. Am I right?
It needs to go someplace that's connected to the + side of the battery. That can be the battery itself, the post on the starter solenoid that the battery cable attaches to, or the post on the horn relay. They are all effectively the same.

Of course, rather than making this difficult, why not just use the heavy red wire that connected to the threaded BAT post on your old alternator?
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Old 05-04-2010, 03:24 PM
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I used a starter relay which is common on Fords. The battery cable connects to the starter relay on one side and transfer the power when the ignition key is turned to the starter. I ran a 8 gauge red wire from the Alternator post (red one) to the battery side of the relay. On some SE alternators, you have to use a jumper wire for self igniting. You'll see two posts on the side of the alternator, label 1 and 2. I bought the wiring clip that pops onto it and simply ran a wire from post #2 to the alternator post (red one). If the alternator doesn't have a self activiting voltage regulator built in, then the wire will tell the alternator to kick in at a certain RPM. I didn't have the self activating mechanism, without the jumper wire, my alternator wouldn't charge. Remember, the alternator is designed to charge the battery, not the starter.
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Old 05-04-2010, 08:58 PM
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In the 70's GM used the large terminal post on the starter as a junction point to connect both the large cable from the battery, and the charge wire from the alternator. The alternator BAT terminal is only connected to the starter because its the junction point.

On my 12si I added a charge cable with a fusible link directly from the BAT terminal on the alternator over to the battery. This way I get a full charge to the battery, regardless of whether the nut on the terminal at the starter is screwed down tight. GM switched to the same wiring arrangement in the mid 90's on the SBC engines.

Bruce
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Old 05-05-2010, 01:26 PM
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Originally Posted by 75gmck25
In the 70's GM used the large terminal post on the starter as a junction point...
On the 1967 GTO in the original post, the horn relay has a similar post that serves the same function and that is much easier to get to, which is why I recommended that.
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Old 05-05-2010, 05:51 PM
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Just keep in mind when routing this wire that is has full battery potential. You need to do everything you can to be sure it cant short out.
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