Another one bites the dust - LS1GTO.com Forums

Vendors


Go Back   LS1GTO.com Forums > GTO Tech > Electronics

Reply
 
Thread Tools Rate Thread
Old 06-24-2019, 10:11 AM   #1
Kfxguy
Registered User
 
Kfxguy's Avatar
 

Join Date: Mar 2017
Location: Denham Springs
Posts: 1,165


Offline
Another one bites the dust

Not sure what this alternator fiasco is i'm going through right now. Original alternator died a couple years ago. I put a reman oreilly unit on. Lasted almost two years including almost a year with the turbo (keep that in mind). It always made a whining sound and died on me about 1.5-2 months ago. I swap it out for another one. It lasts a week or two. So then I put an ac delco Reman on it. It lasted about a month. WTH. Am i just having bad luck? Battery is good. Wires are good. I was in a hurry last time and got a delco reman, This time I'm just gonna wait and I ordered a new delco one.

Maybe the turbo heat is eating them? But then the original oreilly alternator lasted quite a while. The turbo manifold is 3 to 4" from the alternator and the pipe is above the alternator. heat rises was my thought but it also radiates off it. Maybe I should go ahead and wrap the exhaust manifold with heat wrap?

Maybe the reman units are just bad. I have had things like this happen in the past....just kept changing till I got a good one. Maybe getting a new one will solve it. I'm still wrapping pipes. Ive been driving the car every day but I guess i need to park it for a while till I can pull the manifold and wrap it.

thoughts?
__________________
2004 5.7
78mm BILLET turdbo
Summit ghost cam
ss3200 yank
[email protected] 125 8psi (ish) (on 12psi now)
kinda slow but not really
Build thread https://www.ls1gto.com/forums/showthread.php?t=837586
  Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 06-24-2019, 10:36 AM   #2
LS2-GTO
1 of 40,757
 
LS2-GTO's Avatar
 
2006 GTO Owner

Join Date: Aug 2006
Location: New York
Posts: 6,106
Premium Member


Offline
Anyone you ask about this would question the battery first and the connections between alternator and battery second - which you've verified okay.

Dead alternators are due to high amp draw or a poor connection leading to light load on the alternator running away with itself.
__________________
  Reply With Quote Quick reply to this message
Old 06-24-2019, 11:32 AM   #3
Kfxguy
Registered User
 
Kfxguy's Avatar
 

Join Date: Mar 2017
Location: Denham Springs
Posts: 1,165


Offline
Quote:
Originally Posted by LS2-GTO...View Post
Anyone you ask about this would question the battery first and the connections between alternator and battery second - which you've verified okay.

Dead alternators are due to high amp draw or a poor connection leading to light load on the alternator running away with itself.

I'm going to check connections again. maybe the plug that plugs into the alternator is bad or corroded. i dont remember looking at it. that could be possible. thx.
  Reply With Quote Quick reply to this message
 
Old 06-24-2019, 11:50 AM   #4
Kfxguy
Registered User
 
Kfxguy's Avatar
 

Join Date: Mar 2017
Location: Denham Springs
Posts: 1,165


Offline
What about if i have an under drive pulley?, idles at almost stock rpm. voltage is at 13.2 at idle. then mid to high 13's when i start moving. The funny thing is it has happened twice under the same conditions. Sitting at the drive though at taco bell, then half way back to work, light comes on (I have a voltage gauge too in the dash, so its definitely not charging). Maybe my car doesnt like Taco Bell? lol. Temp outside today is 75F also.
  Reply With Quote Quick reply to this message
Old 06-24-2019, 11:59 PM   #5
HMBLGOAT
Registered User
 

Join Date: Mar 2015
Location: CA
Posts: 726


Offline
Are they being tested before you replace them at the parts store - could the pcm not be signaling it on for some reason or the msg not get to the alt?
Not sure what voltage ref is sent to the alt but might be worth simulating that with a switched lead to that pin.

Just a thought before you rule out electricals
  Reply With Quote Quick reply to this message
Old 06-25-2019, 05:48 AM   #6
TheMealOnWheels
Powdercoat all of it
 
TheMealOnWheels's Avatar
 
2005 GTO Owner

Join Date: Apr 2019
Location: South MS
Posts: 39


Offline
If it's accessible, I'd wrap the nearby pipe, it will only help. Next, I'd perhaps try running new + cables, one at a time to see what they do. I had an '00 B4C with 175K miles that had pulsing dash lights, and I found running the Big 3 helped with that issue and more. Turns out, the 8ga to the starter was corroding due to age and heat, and replacing with a 2ga helped with the start (more consistent, faster), which in turn, helped the starter (never replaced). Since then, I've always believed in doing the Big 3... it may be my next upgrade on my GTO.
__________________
'57 Belair LS3/A4
'05 GTO LS2/A4
'14 SS LS3/A6
  Reply With Quote Quick reply to this message
Old 06-25-2019, 06:03 AM   #7
Kfxguy
Registered User
 
Kfxguy's Avatar
 

Join Date: Mar 2017
Location: Denham Springs
Posts: 1,165


Offline
Quote:
Originally Posted by HMBLGOAT...View Post
Are they being tested before you replace them at the parts store - could the pcm not be signaling it on for some reason or the msg not get to the alt?
Not sure what voltage ref is sent to the alt but might be worth simulating that with a switched lead to that pin.

Just a thought before you rule out electricals

Nah they not checking it. I just have it swapped out. Each one does something different. One made bad whining noise. If they check this last one, it will show good because yesterday I put it on the lift, checked the wiring and connections for looseness and corrosion. When I cranked the car up to pull it in the shop, the alternator was charging.....but as i let it idle and it heated up, the voltage started dropping until it got to 12.7 ....it just kicked off.

basically it would start off cold at 14.1....and start dropping as it got warmer. Think the new one will be here today. I wont drive it much until i get the manifold wrapped and a heat shield on it.
  Reply With Quote Quick reply to this message
Old 06-25-2019, 06:34 AM   #8
LS2-GTO
1 of 40,757
 
LS2-GTO's Avatar
 
2006 GTO Owner

Join Date: Aug 2006
Location: New York
Posts: 6,106
Premium Member


Offline
I'd think an alternator can handle a good amount of heat but Lamborghini Huracan's have a water cooled alternator, so you might be on to something.
  Reply With Quote Quick reply to this message
Old 06-25-2019, 06:40 AM   #9
Nothubertjfarnsworth
ಠ_ಠ
 
Nothubertjfarnsworth's Avatar
 
2005 GTO Owner

Join Date: Sep 2006
Location: NWI
Posts: 34,113
Premium Member


Offline
the voltage should drop after startup, but only into the high 13's or so, given there isn't a lot of load on the alternator.

i had issues with my alternator with the SLP UD pulley. With the headlamps, fog lights, air conditioning on it would drop into the 12's.

i got sick of it and upped my idle to 800. problem solved.
  Reply With Quote Quick reply to this message
Old 06-30-2019, 09:46 AM   #10
Kfxguy
Registered User
 
Kfxguy's Avatar
 

Join Date: Mar 2017
Location: Denham Springs
Posts: 1,165


Offline
Update. I finally got to swap it out last night. I had a death in my family, an immediate family member. Wasn’t worried with the car. I had to take car of the funeral arrangements. Anyways

At cruise speed the new alternator is 13.8v once the car warms. It’s a brand new delco this time. Other reman delco looked like junk compared to this one and some wire or something was hanging out of it. The funny thing is I’ve been looking for an overdrive alternator pulley, the reman came with a slightly smaller pulley than the new delco. I put the new one on with the larger pulley that came on it and at idle the voltage drops to 13.1-13.2 but if I idle it up maybe 150-200rpm then it starts going back up. So now today I’m gonna put the smaller pulley off the reman on the new one. I’m keeping the original bigger pulley too, I had another pulley to put on the reman to send it back. This should put me where I need to be. I’ll update. I guess. If anyone cares. Lol.
  Reply With Quote Quick reply to this message
Old 06-30-2019, 02:01 PM   #11
Nothubertjfarnsworth
ಠ_ಠ
 
Nothubertjfarnsworth's Avatar
 
2005 GTO Owner

Join Date: Sep 2006
Location: NWI
Posts: 34,113
Premium Member


Offline
that sucks, sorry to hear that. my condolences.
  Reply With Quote Quick reply to this message
Old 07-01-2019, 06:30 AM   #12
Kfxguy
Registered User
 
Kfxguy's Avatar
 

Join Date: Mar 2017
Location: Denham Springs
Posts: 1,165


Offline
Quote:
Originally Posted by Nothubertjfarnsworth...View Post
that sucks, sorry to hear that. my condolences.

thanks.
  Reply With Quote Quick reply to this message
Old 07-01-2019, 07:31 AM   #13
gastiresnoil
Registered User
 
gastiresnoil's Avatar
 
2005 GTO Owner

Join Date: Feb 2016
Location: Thousand Oaks California
Posts: 39


Offline
Send a message via AIM to gastiresnoil
new Delco

When mine failed last year, I went straight to a new Delco, didn't measure any voltage after the swap, but I was having all kinds of issues with lights and radio, etc-when I finally checked the output of my old one (original at 108k) it was putting out 16v all the time-failed regulator. The brand new unit put it back to 13ish at idle and has worked flawlessly ever since.
__________________
Scott
05 GTO LS2
72 stage 1 Buick (sold)
67 427 Fairlane (wrecked)
73 GS455 Buick (sold)
69 COPO 427 Chevelle (sold b4 they were worth anything!)
  Reply With Quote Quick reply to this message
Old 07-01-2019, 08:29 PM   #14
Kfxguy
Registered User
 
Kfxguy's Avatar
 

Join Date: Mar 2017
Location: Denham Springs
Posts: 1,165


Offline
So as of now, driving around tonight (mid 80’s temp outside...humid) at cruise it said 13.4v on my gauge which is .2-.3 lower than at the battery. At idle, headlights, fog lights, fans and ac on, stereo playing too but not loud.....it was at 12.8v. I’m not happy with that. If I raise the rpm to 1000 it’s at 13.7 ish. So I think I found an overdrive alternator pulley, I ordered it this morning.
  Reply With Quote Quick reply to this message
Old 07-03-2019, 04:06 PM   #15
Kfxguy
Registered User
 
Kfxguy's Avatar
 

Join Date: Mar 2017
Location: Denham Springs
Posts: 1,165


Offline
I think I found a overdrive pulley. It happens to be for a ford alternator. All the measurements match. So I ordered one from a bogue eBay seller. After I bought it, my estimated ship time was like two weeks out. Not happy about that. I emailed them to confirm and I haven’t got a response. I may buy another one from a faster seller and just sell this one when it comes in. Here’s the pulley.

https://store.alternatorparts.com/partno242271.aspx
  Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the LS1GTO.com Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Location
Where you live (must be accurate to IP location, if wrong you may be permanently banned)
Insurance
Please select your insurance company (Optional)

Log-in


Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -8. The time now is 11:00 PM.




Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.