Voltage on pin 1 of SI alternator - Team Camaro Tech
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post #1 of 5 (permalink) Old Mar 1st, 10, 05:21 PM Thread Starter
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Brian
 
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Voltage on pin 1 of SI alternator

Hey guys...

Got a perplexing problem with my alternator not turning on.

It is in a 68 with all new wiring harnesses, Tic toc tac, and console gauges. All correct wires, nothing changed except the splicing necessary where the original external voltage regulator would be.

With the ignition on, I'm getting exactly battery voltage at the exciter (pin 1) wire at the alternator connector. From what I've read, this should be hooked up with the "Gen" dash dummy light in the middle to provide a bit of resistance. Yet I'm getting 12.3 volts.

Being I have console gauges with a tic toc tach, I have no gen light... So I am unsure if or where the necessary resistance is happening. Like I mentioned, these are all new, correct harnesses so it "should" be like factory.

Anyone out there with a similar set up able to measure their voltage at pin 1 with the igintion on and see what they get?
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post #2 of 5 (permalink) Old Mar 2nd, 10, 03:04 AM
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Re: Voltage on pin 1 of SI alternator

Some aftermarket alts need to be revved up to start. OE's don't.
If the new harness matches factory original, jumper the two outside wires of the ext regulator. You might need to jumper the inside wires also.
If the new harness is wired for an int reg alt, Post 1 should be on-off with the key.
Post 2, a sensor wire, should go to the fuse panel to sense the load, lower voltage to pump up more.
Console ammeters are connected between the horn relay buss bar and the battery junction block and measure millivolts across the length of wire going across the rad support.

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post #3 of 5 (permalink) Old Mar 2nd, 10, 07:49 PM Thread Starter
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Brian
 
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Re: Voltage on pin 1 of SI alternator

Thanks for the info. I don't remember trying to rev it up, so that might just might be it; also thanks for explaining the ammeter wiring! Helps a ton.
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post #4 of 5 (permalink) Old Mar 3rd, 10, 03:39 AM
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Re: Voltage on pin 1 of SI alternator

You're welcome. Let us know if it works or not.

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post #5 of 5 (permalink) Old Mar 3rd, 10, 01:51 PM
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Re: Voltage on pin 1 of SI alternator

You aren't running a smaller pulley at the crank are you (slows down accessory drives)

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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