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Why won't my speed Inc alternator charge?!?

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Old 09-04-2010, 01:44 PM
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Default Why won't my speed Inc alternator charge?!?

Ugh I just wired the factory wire to the "F" connector and it still won't charge!!!! Any ideas? I'm really frustrated
Old 09-04-2010, 01:55 PM
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It is a 5-1/8 case needed and you need to add a 1/2 watt 470 ohm resistor in line and the stock alternator wire goes to "L" on the harness.
Old 09-04-2010, 02:51 PM
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There is no L.... There are three wires from the plug, S is a big wire, and then the two smaller wires are F and P
Old 09-04-2010, 03:02 PM
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and why the heck would i need to do anything like that. The speed inc guy said it was a one wire hookup when I asked him on the phone. He said nothing about adding resistors or anything. I bought the alternator AND bracket from them
Old 09-04-2010, 03:30 PM
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Ok, don't get mad at me. That is the way mine is hookedup. Speed Inc couldn't tell me **** about it. There sales reps are exactly that sales reps.
Old 09-04-2010, 03:35 PM
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no im not mad at you, sorry, im mad at speed inc! I missed a car show that I paid to get entry to, and now my car is going to be down until I get this figured out. And im assuming they are closed monday for labor day

Anyone else have this issue? Ill post pics of the connector later.
Old 09-04-2010, 03:39 PM
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It's the middle wire on my connector. You need the resistor to get the alternator to switch on. Theyare like 99 cents for 6 at radio shack
Old 09-04-2010, 03:45 PM
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How did you end up figuring that out?!?
Old 09-04-2010, 05:07 PM
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Looking thru schematics and some help from Frost. As soon as I did what I listed the car started charging at 14 volts.
Old 09-04-2010, 06:04 PM
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Originally Posted by MUSTANGBRKR02
Looking thru schematics and some help from Frost. As soon as I did what I listed the car started charging at 14 volts.
Just tried it, doesnt work. runs at 11.2 volts :/
Old 09-04-2010, 06:13 PM
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L terminal with a 1/2 watt 470 ohm resistor in line with the factory wire. and its still not working. any other ideas?
Old 09-04-2010, 06:20 PM
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11.2 means it's charging just low
Old 09-04-2010, 06:45 PM
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11.2v is not charging. charging is 13.5- 14.5v

is there an included wiring diagram? or do you have pics of the alternator? a link?
Old 09-04-2010, 07:03 PM
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The small wire comes from a switched source.
It gives the regulator in the ALT feed back to let it know what the voltage is
after it’s been passed true the fuse box.

The resistor is just a way to lie to the regulator to make it put out more.

Some people will get this confused with needing a diode in the signal wire,
on older GM cars when using a MSD or other aftermarket ignition boxes.

In some case the cars would not die after turning the key off dew to a back
feed through the signal wire.

You do not need a resistor to make your ALT charge.
Turn your key to the run position and unplug the small wire
and test it for voltage.

If it has voltage you have it plugged into the wrong place on the ALT
or the ALT is no good.

If you don’t have voltage to the wire check your fuse box.

Last edited by TT350; 09-04-2010 at 07:15 PM.
Old 09-04-2010, 07:26 PM
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hopefully this helps you out
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Old 09-04-2010, 07:31 PM
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Originally Posted by kmracer
11.2v is not charging. charging is 13.5- 14.5v

is there an included wiring diagram? or do you have pics of the alternator? a link?
11.2 means that the alternator is being ignited. It isn't chatging at the optimum level.

If you read thru prior threads on this you will see that other people have had this problem and had to go to a overdrive pulley on the alternator.

Not charging is not showing anything and running off of the battery, two totally different problems.
Old 09-04-2010, 07:46 PM
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Originally Posted by MUSTANGBRKR02
11.2 means that the alternator is being ignited. It isn't chatging at the optimum level.

If you read thru prior threads on this you will see that other people have had this problem and had to go to a overdrive pulley on the alternator.

Not charging is not showing anything and running off of the battery, two totally different problems.
this isnt correct, b+ on the alt goes directly(almost) to the batt. a CHARGED battery will read 12.6v, if its anything less than 12.3ishv while NOT running you have a problem with the batt or it needs to be charged.

if the battery is reading 11.6v while the car is running, its not being charged, its being drained. the alternator isnt doing anything. if you have to put an overdrive pully on the alternator you have problems.
Old 09-04-2010, 08:28 PM
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Originally Posted by TT350
You do not need a resistor to make your ALT charge.
Turn your key to the run position and unplug the small wire
and test it for voltage.

If it has voltage you have it plugged into the wrong place on the ALT
or the ALT is no good.

If you don’t have voltage to the wire check your fuse box.
There is voltage at my signal wire and it is apx. 10v. Im thinking that my battery being low is causing it not to charge, as i have heard that if the regulator does not see at least 12v, it will not start charging.

unfortunately nobody carries the optima in stock so it will take a few days to get another :-/

on that note, im ready to return this thing. With the supplied hardware, the alternator does not fit (back of the alt hits the head) so i shimmed it a bit with 1 washer on each bolt so that the alt clears, but now the pulleys are misaligned causing a squek. Anyone else ever notice that? I dont want to grind the case of this alt, because it looks like ill be grinding all over it to make it clear.

i made a $2 bracket that I fabbed that works way better than this, I just wanted something that looked a little nicer.


if someone could give some advice on the fitment as well that would be great. Im pretty frustrated at this point.
Old 09-04-2010, 08:36 PM
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whats the voltage of the batt? there shouldnt be more than a .25 - .5 v "voltage drop" from the batt to the signal wire.

whats the point of the alternator? more amprage? honestly, if you're having this much trouble is it worth it?
Old 09-04-2010, 08:56 PM
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Originally Posted by kmracer
whats the voltage of the batt? there shouldnt be more than a .25 - .5 v "voltage drop" from the batt to the signal wire.

whats the point of the alternator? more amprage? honestly, if you're having this much trouble is it worth it?
To move the alternator to the passenger side head , while being low sitting and tucked into the engine.

Mine did not have to be shimmed but i did have to drill the holes to the correct size. It wasn't worth what we paid. But i just went and bought a autozone alternator and pigtail.


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