New Battery + New Alternator and it still dies! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-07-2008, 07:02 PM   #1
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Default New Battery + New Alternator and it still dies!

I had a new battery and alternator put in a little over a week ago because as I'm drivinng my check guages lights up and the battery power meter starts dropping really fast. I brought it to my mechanic and he said there were two loose wires connected to the alternator. He tightened them and every thing was running smooth until twenty minutes ago! has this happened to anybody? I have the car for a year and a half without any problems and this started happening out of nowhere.

Any help would really be appreciated.

Thank you,

Mase.
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Old 01-07-2008, 08:19 PM   #2
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See if your wires running off the battery are hot. Still make sure the wires on your alternator are tight.
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Old 01-07-2008, 09:07 PM   #3
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Please put you model and year into your sig.. That will help us give you more answers..

Have the battery cables been cleaned? Positive is usually the one that gets really nasty

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Old 01-07-2008, 11:37 PM   #4
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Thanks for the input. I will check this out tomorrow.
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Old 01-08-2008, 01:15 AM   #5
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Good rule of thumb with this situation is to clean EVERY electrical connection you can find that has anything to do with the charging system, hell, do it even if it doesn't, and put dielectric grease on it. that might just narrow it down right off the bat.

focus especially on the battery cables...pull the boots off and clean em REAL well.
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Old 01-08-2008, 12:58 PM   #6
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your probably running off the battery because the alternator went out.
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Old 01-09-2008, 12:29 PM   #7
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I would check the oil level to make sure that it is right. Too much oil can get on to your spark plugs and cause the bat charge light to come on and cause your car to die. This sit sounds familiar cause it happened to my 97 bonneville. i did every thing you did. Then I checked the plugs they were covered with burnt oil. I couldn't smell it.
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Old 02-16-2008, 10:44 AM   #8
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Had another alternator put in and it ran great for about a month, BUT it shut off again yesterday!!!! This is really frustrating.
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Old 02-16-2008, 10:52 AM   #9
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It is possible to get a alternator bad from the box....if you got it new or rebuilt. If you got a junkyard one...those are always a crapshoot. Take both the battery and the alternator to get them checked and have the battery charged. If all is good with both, put them back on the car, and immediately take it to either advance or autozone for a free charging system check. Things may pass on the bench, but also fail when in the "real world", i.e. heatsoak, moisture, etc...
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Old 02-18-2008, 04:04 AM   #10
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All five Pontiacs I've owned have needed to have the battery cables replaced. Typically the positive cable corrodes inside its protective red rubber sheath, throughout its length. You can't see this unless you slit the protective insulation and peel it back along its length.

You might have the same problem. I had carefully cleaned all of the battery terminals and clamps using a small soft wire brush on a Dremel tool. It made no difference, because the problem was corrosion of the positive cable along its length. Replacing the positive cable was the only fix.

In each case, I'd replaced the battery, then the alternator, and kept getting stranded with a car that wouldn't start.
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