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Multiple Alternators and Batteries, still no luck.

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Old 06-16-2017, 06:45 PM   #1
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Multiple Alternators and Batteries, still no luck.

Hey guys i got an 88 firebird 5.0 TBI. I have replaced the alternator and the battery 4 times, and the battery will not hold a charge. Each time that Ive had Oreillys and Autozone test the alt. and the battery, the alt regulator always comes back as FAILED. Idk what to do anymore. Ive replaced the battery cables with brand new ones...no change. I cleaned all of the grounds and made sure that they were on bare metal... no change. Made sure all grounds and fuseable links to the starter were secure and clean. All of my fuses are good and the braided ground on the passenger side of the engine is good as well. Today I had a family friend look at the voltage reg pigtail. Mine has three wires: A thick red wire(which always has fire to it, idk if its supposed to), and thinner brown wire, and a black wire. The black and brown have no fire to them. When the black and the red were touched while the car was running, the idle came down and the battery showed to be charging. Once he let go the battery then went back to not being recharged. Idk guys im real down rn, with this car, I dont wanna junk/sell her over something like this but man like my confidence is in pieces, please help!
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Old 06-16-2017, 07:35 PM   #2
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Re: Multiple Alternators and Batteries, still no luck.

The brown wire should be a 12V switched and is the wire telling the alternator to charge. If that wire had no power to it while the engine is on the alternator will make no power, the pulley will just be spinning and cause the battery to drain. Find out if that wire has 12V + power with the engine on.

Also, is the alternator being tested on the vehicle? Is the parts store testing them before the part leaves the store when it's new?
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Old 06-16-2017, 07:40 PM   #3
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Re: Multiple Alternators and Batteries, still no luck.

Ohhh okay so that explains why when my friend touched the red wire to the brown wire, that thats why then it started to work. Would it be wise to splice those together? Would you suggest getting another alt? I had this one tested in and out of the vehicle. and this latest alt was tested before i took it home, and it had passed
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Old 06-16-2017, 07:58 PM   #4
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Re: Multiple Alternators and Batteries, still no luck.

You may have just blown the fuse on the brown wire. You could splice into the red wire but that is constant power and could drain your battery or shorten the life span of your alternator. Best long term solution is to fix the brown wire if that's the problem.
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Old 06-16-2017, 08:30 PM   #5
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Re: Multiple Alternators and Batteries, still no luck.

If you are using cheap AutoZone or O'Riley's alternators that's a big part of your problem. They are JUNK and you will keep replacing them till you buy a quality unit. Order a Powermaster from Summit, etc.

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Old 06-17-2017, 08:21 PM   #6
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Re: Multiple Alternators and Batteries, still no luck.

Some NAPA stores will not even sell a reman alternator or starter. They have changed rebuilders so many times, that warranties are not honored. The latest place that is doing the rebuilds are only replacing the defective component(s). You are not getting a completely remanufactured piece with all new parts. As I understand it, there is 1 rebuilder that supplies all the parts stores.
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Old 06-18-2017, 09:42 AM   #7
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Re: Multiple Alternators and Batteries, still no luck.

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Originally Posted by gavin.priestley View Post
Today I had a family friend look at the voltage reg pigtail. Mine has three wires: A thick red wire(which always has fire to it, idk if its supposed to), and thinner brown wire, and a black wire. The black and brown have no fire to them. When the black and the red were touched while the car was running, the idle came down and the battery showed to be charging. Once he let go the battery then went back to not being recharged. Idk guys im real down rn, with this car, I dont wanna junk/sell her over something like this but man like my confidence is in pieces, please help!
On that connector there are letters molded into it. The S terminal is the heavy red and goes to a fusible link to the starter. This means it is hot all of the time. It is the alternator sense terminal for voltage regulation.

The other two terminals on that connector (the pigtail with the wires), are only hot with the ignition on. The F terminal being fed by the C-H/FAN fuse.

And the L terminal being fed by the GAGES fuse. A digital dash car has a small light bulb in series with that feed. A non-digi car has a resistor in series with that fuse.

The odd thing is, that a hot on either F or L will cause the alternator to charge. So not sure why GM wired it this way, but that is what the '88 FSM shows.

So check those two fuses first, if the C-H/FAN fuse is blown the engine coolant fan won't work either.

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Old 06-18-2017, 06:24 PM   #8
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Re: Multiple Alternators and Batteries, still no luck.

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Originally Posted by RBob View Post
The odd thing is, that a hot on either F or L will cause the alternator to charge. So not sure why GM wired it this way, but that is what the '88 FSM .
Redundancy. Isolated fuse failure or bulb failure won't cripple the charging system.

Most alternators will self excite though if you get their RPM's way up. Like 5k rpm alt shaft speed. Not sure about CS alts but the SI ones will.

GD
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Old 06-18-2017, 10:22 PM   #9
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Re: Multiple Alternators and Batteries, still no luck.

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Redundancy. Isolated fuse failure or bulb failure won't cripple the charging system.

GD
But how would you know if the alternator failed? Wouldn't knowing that be better then using screwy setups?

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Old 06-19-2017, 12:07 AM   #10
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Re: Multiple Alternators and Batteries, still no luck.

Well if the bulb fails and you have a digi-dash then you won't know if the alt fails. But the giveaway would be no battery warning light during key-on. The operator is supposed to check the operation of all warning lamps prior to driving. An inoperative warning lamp should definitely be noted in the log book. LoL.

If you have a gauge it should be independent of the alternator so failure would be obvious.

That's all just guessing.... But sure!

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Old 06-19-2017, 09:48 AM   #11
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Re: Multiple Alternators and Batteries, still no luck.

The bulb on the digi-dash cars is hidden, not view-able.

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Old 06-19-2017, 10:57 AM   #12
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Re: Multiple Alternators and Batteries, still no luck.

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The bulb on the digi-dash cars is hidden, not view-able.

RBob.


Some engineer needed to be fired over that.

GD
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Old 06-21-2017, 01:54 AM   #13
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Re: Multiple Alternators and Batteries, still no luck.

Hey guys I've changed the ignition switch and the brown wire on the alternator still has no power. Ive heard and now read that the C/H Fan fuse may have something to do with my problem? Cause idk who had this car before me, but the people removed the electric fan and installed a traditional "waterpump mounted" fan and removed the Fan fuse, sooooo idk what do you guys think? Could someone give me a schematic for the wires that go to and from the alternator. So if i replace the fuse, will the alternator finally charge?

Last edited by gavin.priestley; 06-21-2017 at 02:00 AM.
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Old Yesterday, 08:46 AM   #14
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Re: Multiple Alternators and Batteries, still no luck.

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Originally Posted by gavin.priestley View Post
So if i replace the fuse, will the alternator finally charge?
It should start to charge, but this depends upon how hacked up the harness is.

RBob.
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Old Yesterday, 06:47 PM   #15
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Re: Multiple Alternators and Batteries, still no luck.

WOW. It even says on that wiring diagram, "Hidden Generator Lamp".
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