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Old 12-01-2011, 01:51 PM   #1
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Battery light on?

Well I just got done changing up a few things on my s10 and now my battery light says on. Well I started with a fbody bracket and alternator and I changed to the corvette alternator and bracket with power steering. That was the only thing I chaged. I didn't mess with any grounds and used the same power wire to the alternator. I tested the alternator and battery, found out the my red top battery was bad. Got a brand new red top battery and the light is still on! Anyone got any ideal what it could be?
Old 12-01-2011, 02:39 PM   #2
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Re: Battery light on?

is it charging normal?
Old 12-01-2011, 02:44 PM   #3
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Re: Battery light on?

Are the alternator turn on wires the same on both? Just a thought.......
Old 12-01-2011, 03:10 PM   #4
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Re: Battery light on?

Yeah check and it wad charging 14.1 and that was with the bad battery
Old 12-01-2011, 03:11 PM   #5
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Re: Battery light on?

Quote: Originally Posted by longboxdime
Are the alternator turn on wires the same on both? Just a thought.......
I'm not sure on that.
Old 12-01-2011, 07:44 PM   #6
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Re: Battery light on?

Same problem I have a new red top new alternator new battery cable gauge reads 2.5 volts higher and battery light is constantly on but with a volt meter it's at 14.3 but reads around 16- 18
Old 12-01-2011, 08:51 PM   #7
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Re: Battery light on?

How many wires is in the alternator plug? What year of vette alternator did you get?
Old 12-01-2011, 09:23 PM   #8
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Re: Battery light on?

^^That and is the Vette Alternator wired differently?
Old 12-01-2011, 10:09 PM   #9
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Re: Battery light on?

Yes the fbody's have 1 wire and the earlier vette's had 2 wire's and the newer vette's are 3 wire alternator's.
Old 12-01-2011, 10:11 PM   #10
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Re: Battery light on?

Get a schematic on the Vette one and see what has to be done.
Old 12-02-2011, 08:05 AM   #11
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Re: Battery light on?

I am not sure what year the alternator is. All I know it's from a c5. I'll have to look more into it.
Does anyone know if a fbody alternator will bolt right in the c5 bracket?
Old 12-03-2011, 03:45 PM   #12
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Re: Battery light on?

I run a truck alternator I think like a dr22 or something, Anyways its a 2 wire plug and charges fine along with the gauge working as it should but the battery light on mine is also always on right from the get go. Interested to see what people come up with here.
Old 12-03-2011, 03:59 PM   #13
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Re: Battery light on?

did you get your NEW optima tested?
Old 12-03-2011, 04:35 PM   #14
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Re: Battery light on?

Quote: Originally Posted by StirFrey
did you get your NEW optima tested?
No but I called cpw and they said I need another wires going from my alternator to my fuse box
Old 12-03-2011, 07:40 PM   #15
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Re: Battery light on?

to which fuse?
Old 12-03-2011, 08:23 PM   #16
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Re: Battery light on?

They said to the battery fuse. They said when I get to the point to wiring it to just give them a call and they would tell me where. So you might just want to give them a call
Old 12-03-2011, 09:04 PM   #17
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Re: Battery light on?

Hmm, I did get my harness from them, Ill have to ask them.
Old 12-03-2011, 09:43 PM   #18
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Re: Battery light on?

I got my wiring harness from Jared at Cpw too. But when I hooked mine up my battery light came on. Im using the Ls2 corvette alternator. After inspection the F terminal was pinned out wrong on my ecu. After switching the wire fixed my problem..

BTW Im in no way talking crap on Cpw or jared they are Awesome products and refer them to anyone..
Old 12-03-2011, 10:27 PM   #19
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Re: Battery light on?

Same boat as me. theres been some complications but I still wouldnt have it any other way. Do you happen to remember which circuit or name listed on the pin you had to move it to. I have a wiring schematic and pinout for the ecu and tune Im using.
Old 12-03-2011, 11:53 PM   #20
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Re: Battery light on?

Quote: Originally Posted by tiresmokinV8
Same boat as me. theres been some complications but I still wouldnt have it any other way. Do you happen to remember which circuit or name listed on the pin you had to move it to. I have a wiring schematic and pinout for the ecu and tune Im using.


Yeah mine was the f terminal on the alternator plug. It was pinned into connection 2 terminal 75 and it should have been connection 2 terminal 52.
Old 12-04-2011, 12:52 PM   #21
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Re: Battery light on?

What was the name of the circuit if you know? My ecu and tune are most likely different then yours.
Old 12-04-2011, 03:50 PM   #22
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Re: Battery light on?

Quote: Originally Posted by tiresmokinV8
What was the name of the circuit if you know? My ecu and tune are most likely different then yours.


O yeah sorry. Its called the Generator Field duty cycle signal..
Old 12-04-2011, 04:02 PM   #23
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Re: Battery light on?

Quote: Originally Posted by s-10ls1
They said to the battery fuse. They said when I get to the point to wiring it to just give them a call and they would tell me where. So you might just want to give them a call

If you have a c5 alternator and are coming from a 1 wire fbody alt. you dont need a wire going to the fuse box it needs to go to the Ecm.

You have 2 main wires from the alt the Generator turn on signal and the Generator Field duty cycle signal If you dont have the cycle signal wire hooked up the battery light will come on due to it not registering that your alternator is charging correctly.
Old 12-04-2011, 08:32 PM   #24
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Re: Battery light on?

You can sort of see the plug in this picture.


2 pin plug running a 140amp truck alternator. Ill have to check out the wiring. Thanks.
Old 12-08-2011, 03:10 PM   #25
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Re: Battery light on?

I just looked through our build sheets and it does look like there was an error in some of our stuff. Some of the harnesses were built with one of the alternator wires going to C2 75, when in fact it should go to C2 52.
So, Anyone getting a battery light on might take a look and see if there is a wire in the wrong spot on the red computer connector.

C2 75 is the right spot on some of the later computers, but if your light is on, might try switching that wire to pin 52. Should be a gray wire.
Old 12-09-2011, 11:02 PM   #26
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Re: Battery light on?

With those pins possibly mixed could that throw the gauge reading off? If I unplug my alt. My gauge still reads, and no matter what it shows 2+ volts higher
Old 12-10-2011, 01:23 AM   #27
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Re: Battery light on?

hmm, My lights on but my gauge reads correctly and at first I didnt have the alt connected and it read nothing.

Jared what plug would I look in for my e67 ecu, I think its pin 29 in c3?
Old 12-12-2011, 10:08 AM   #28
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Re: Battery light on?

Quote: Originally Posted by tiresmokinV8
hmm, My lights on but my gauge reads correctly and at first I didnt have the alt connected and it read nothing.

Jared what plug would I look in for my e67 ecu, I think its pin 29 in c3?
I think yours may be a different issue. You probably need a generator battery control module on the neg battery cable.
Looks like this:

Old 01-01-2012, 10:15 PM   #29
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Re: Battery light on?

Anyone had this problem running a stock 2000 5.3 computer and harness? Mine is on but is charging fine as it has not killed the battery yet.... Seemsto be ok but i hate the light on
Old 05-03-2013, 02:37 PM   #30
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Re: Battery light on?

saw this post ways back and it had me hoping this wouldn't happen on my truck, however it is.
i have the battery ligh on.

my alternator also has one brown wire and is a LS2 alternator.

i called Jared on it ways back in November and was told I wouldn't have the light on, though it is.

what can i look for or do to correct it?
Old 05-03-2013, 03:31 PM   #31
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Re: Battery light on?

just checking a note i had from Jared and he mentioned that, the one light brown alt wire should go to:

C2 Pin 15

i do have a light brwn wire running there but also have another light brown wire in C2 Pin 2.

on the alternator it has three connectors with only the one light brown wire going in.
that one wire is on the connector to the very left OR driver side.
Old 05-04-2013, 07:53 PM   #32
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Re: Battery light on?

I have a harness that Jared sent me to correct this issue. I will check it out tomorrow, and let everyone know what he sent me.
Old 05-04-2013, 09:27 PM   #33
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Re: Battery light on?

I am looking forward to hearing about this.

Great of Jared to work with you. He's super helpful!
He's helped me out on several issues that didn't even relate to things I purchased from CPW.

Hope it works out.

I'm on a waiting list to be called back myself.
You can't pass emissions here with any dummy lights on.

Can you post pics of what you received?
Old 05-05-2013, 11:28 AM   #34
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Re: Battery light on?

Every swap I have done has this same issue. Easy fix, pull the cluster and break the bulb or put a black piece of a sock or something in the cavity for the light on backside of cluster. Problem solved.
Old 05-05-2013, 11:36 AM   #35
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Re: Battery light on?

That would solve crap!

Would still throw a code and couldn't pass emissions.
Old 05-05-2013, 09:44 PM   #36
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Re: Battery light on?

Quote: Originally Posted by Sleeper S10
That would solve crap!

Would still throw a code and couldn't pass emissions.
What code??? Maybe I am not reading something correctly but I think the OP is only trying to get the battery light from coming on, no code.
Old 05-05-2013, 11:12 PM   #37
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Re: Battery light on?

I ended up just pulling the bulb out
Old 05-05-2013, 11:15 PM   #38
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Re: Battery light on?

Quote: Originally Posted by s-10ls1
I ended up just pulling the bulb out
Now that's a success story!! Problem solved
Old 05-05-2013, 11:21 PM   #39
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Re: Battery light on?

you probably need two wires going to the pcm from the alternator. a brown or red one in c2 15 and a gray one in c2 52. The brown or red one should be in the b position on the alternator and the gray one should be in the c position.
Old 06-28-2013, 01:48 PM   #40
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Re: Battery light on?

thanks to Jared/CPW, tev01 and AceHaag for helping me.

MY BATTERY LIGHT IS OUT!
Old 06-28-2013, 01:51 PM   #41
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Re: Battery light on?

Pair of needle nose pliers would get the light out too.
Old 06-28-2013, 01:55 PM   #42
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Re: Battery light on?

Quote: Originally Posted by CPWire
Pair of needle nose pliers would get the light out too.
I never thought a pro like you would say something sooooo funny!!!
Old 06-28-2013, 01:56 PM   #43
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Re: Battery light on?

lol
Old 06-28-2013, 05:47 PM   #44
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Re: Battery light on?

Wheres the bulb for the batt light? I've taken the back black cover off the IP and all I see is the circuit board.
Old 06-28-2013, 06:58 PM   #45
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Re: Battery light on?

They are surface mounted LEDs, just find the one behind the symbol for whatever lights you want gone and rip it off the circuit board. Pretty easy to do actually.
Old 06-28-2013, 07:30 PM   #46
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Re: Battery light on?

I take it there is no fix for his tiresmokings combo?
Old 06-28-2013, 07:57 PM   #47
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Re: Battery light on?

Depends on why the light is on, with some of the newer computers, it takes a generator control module to be wired in just to turn off a light.
Old 06-28-2013, 10:08 PM   #48
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Re: Battery light on?

I guess I would rather buy a generator module that way I don't get stranded. To each his own though. I have not had the pleasure to mess with any new style ecms so thank you for enlightening me Jared.
Old 06-28-2013, 10:13 PM   #49
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Re: Battery light on?

On mine its charges at 13.8v at all times. So with the reading Ive done theres a fault somewhere in the field generator circuit. the pcm tells the alternator how much to put out on the newer setups. '10 Colorado os on '10 e67.
Old 06-28-2013, 10:27 PM   #50
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Re: Battery light on?

When you pull the back cover off it will look like this.



There are some small white clips that hold the board down. Unhook them and flip it over. The just pull the bulb out that's behind the battery sign. This pic kinda shows you what it looks like. I pulled the abs light and a security light.

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