new battery, new alternator, still dying. - Performance Forum

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new battery, new alternator, still dying.
Monday, November 07, 2011 7:30 AM
04 cav with m62. New yellow top was recently installed along with a new cobalt ss alternator. After sitting for more than one day, the car will barely start. Longer than one day and it will not start. I had this problem before so I took out my redtop and replaced it with a yellow. Car ran awesome for a month. Then it started doing it again and finally shut down on me while driving. I put in the ss alternator. After that the car started the best it ever has, all interior lights were brighter than ever, windows and wipers were fast again but now its doing the same thing again and barely started this morning after sitting all day yesterday.
All connections are tight and there is no corrosion anywhere...
Any ideas?

Re: new battery, new alternator, still dying.
Monday, November 07, 2011 7:45 AM
I had a simular issue with my car last winter, turned out my electrical draw was a bad factory ground on the engine harness. I'd start with checking the grounds on the car. Have you done any work to the car in the last month or when the issue first showed up.






Re: new battery, new alternator, still dying.
Monday, November 07, 2011 7:59 AM
I Had the exact same problem with my car and it turned ot when I moved the battery to the trunk I forgot to re-ground between the motor and body. Double check your grounds between the body and motor, battery to body, and wire harness to the motor grounds.



Re: new battery, new alternator, still dying.
Monday, November 07, 2011 8:38 AM
I believe I relocated my ground to a different bolt a while back but can't remember. Ill check those out and shine the contact points up
Re: new battery, new alternator, still dying.
Monday, November 07, 2011 9:13 AM
Also, I've heard a few people mention a possible linkable fuse problem? What is this and could this be a possibility?
Re: new battery, new alternator, still dying.
Monday, November 07, 2011 10:07 AM
Did you install an after market stereo with an amplifier? If so make sure you installed your remote turn on correctly and not to directly to a 12 volt source or it will drain your battery.



Re: new battery, new alternator, still dying.
Monday, November 07, 2011 12:07 PM
jeremiah, check the alternator to starter wire. this has a fusable link in it... well, at least the one on an LD9 does, idk about an L61. id assume so...

if that wire is fubar she wont charge the battery.



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Re: new battery, new alternator, still dying.
Monday, November 07, 2011 1:32 PM
Yeah I've had the stereo in here for over 7 years so that can't be it. As far as the linkable fuse ill check this weekend. What does this look like? Just a wire?
Re: new battery, new alternator, still dying.
Monday, November 07, 2011 2:07 PM
yea its a tiny pos wire that goes from the alternator lug over to the starter.



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Re: new battery, new alternator, still dying.
Monday, November 07, 2011 2:56 PM
Yeah I've had the stereo in here for over 7 years so that can't be it. As far as the linkable fuse ill check this weekend. What does this look like? Just a wire?
Re: new battery, new alternator, still dying.
Tuesday, November 08, 2011 5:55 AM
My ld9 dont have a fuse between the alt and starter and if it is a blown fuse it will leave the cicute open. Think of a fuse like a switch. When the switch closes the circuit is closed and it will make an electrical path. If its open the fuse is blown and there will be no circuit. Electricity takes the path of least resistance so just keep that in mind when looking for whats draining your battery. And i wouldnt discount your stereo just becuase its been installed for seven years. Things do break so try disconnecting your amp and see what happens. If it still drains then a t least youve trouble shot that part of your electrical system.




Re: new battery, new alternator, still dying.
Wednesday, November 09, 2011 5:32 PM
do you have a volt meter? check by the battery with it started and with the engine off. should be like 13-14volts when started. If not the ground to the engine would be my guess, I had that problem when I put a new engine in my truck, I rewired everything and never thought to ground the engine.....


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Re: new battery, new alternator, still dying.
Thursday, November 10, 2011 8:51 AM
brodycog wrote:My ld9 dont have a fuse between the alt and starter and if it is a blown fuse it will leave the cicute open. Think of a fuse like a switch. When the switch closes the circuit is closed and it will make an electrical path. If its open the fuse is blown and there will be no circuit. Electricity takes the path of least resistance so just keep that in mind when looking for whats draining your battery.


Not necessarily. I've had where you test the voltage on through a bad fused link and it was fine. Then after the circuit was closed the voltage went crazy low to something like 5.9v, but it was still there. Preventing an alternator from working.

I'm wondering if the OP ever has issue with lights (headlights, interior, dash lights) flickering?





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Re: new battery, new alternator, still dying.
Thursday, November 10, 2011 11:20 AM
only way to fix this problem is with a voltmeter... no one on here is going to be able to "guess" an electrical problem...get yourself a good volt meter and start checking alt output, battery output, and power draw when the car is off. ... and have you dont any kind of battery relocate?



Re: new battery, new alternator, still dying.
Thursday, November 10, 2011 3:20 PM
brodycog wrote:My ld9 dont have a fuse between the alt and starter and if it is a blown fuse it will leave the cicute open. Think of a fuse like a switch. When the switch closes the circuit is closed and it will make an electrical path. If its open the fuse is blown and there will be no circuit. Electricity takes the path of least resistance so just keep that in mind when looking for whats draining your battery. And i wouldnt discount your stereo just becuase its been installed for seven years. Things do break so try disconnecting your amp and see what happens. If it still drains then a t least youve trouble shot that part of your electrical system.


Not true, you could have a scorched fuseable link which will still conduct electricity, just that its missing parts of the conductor along the way, making its resistance higher.


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