Battery? Alternator? Help!

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PuckHead

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Hey all,
Havn't been on the site for a couple weeks, but now find myself in need of help from the all-knowing, all-seeing Forum.

Last night while running some errands for the AWA, I noticed my battery light came on. The car didn't act any different than normal, and I just figured it came on because I was putting a big draw on the system with the heater on high, Rr. Def. on, stereo, and headlights.

After I got home, I remembered that I missed a stop, so after dinner I went back out to go to the stop I had missed and the car wouldn't start. Just sat there and clicked for a second. All the segments on the EATC were on, and the airbag light was on steady as well. It was too damn cold and dark out to worry about last night so I just let her sit in the driveway.

Today I go out and attempt to start her, and she turned over with no problem and fired right up. I went back in the house for ~15 minutes so she could warm up and when I went back outside, she had died and wouldn't start again, almost the same as last night. Just sat there and clicked.

A couple of hours later, I went out to try it again, and she fired up fine, but the tach wouldn't move, the EATC was lit up again, along with some other dummy lights. The worst part was that she would barely idle. I put my foot into her a little bit, and she sounded like she was only hitting a couple of cylinders. Didn't sound right and I shut her off quickly.

The battery is an Interstate, and is only a little over a year old, so I am thinking that it must be the alternator. I can't measure the voltage, or get a reading on the alt's output since I don't have a gauge, but with all this info given to you, what would you say?

Alternator or Battery?

Any info and opinions are welcomed!

Later!
:)
 

Slo-Sho

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It's really hard to say without having the proper equipment to diagnose the problem, anything else is pure speculation. I will say that it is a good idea to check for continuity at the 3 terminal plug at the top of the alternator. These are infamous for causing intermittent connections.
 

JIMSHO

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the plug on the alt. has been known to corrode and even start to melt because of the resistance
 

JIMSHO

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the plug on the alt. has been known to corrode and even start to melt because of the resistance that would cause the alt from charging
 

qiksho

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Check your battery with a meter...should read low 13's. IF not charge it up.

Clean contact points and reconnect.

IF your battery needed a charge. THEN: Turn on the lights, eatc, stereo, etc to put a draw on the battery for a few minutes. DO not start the car. Recheck battery with meter...shouldn't have dropped more than .2 or .3 from first reading.

If your battery was fine. Start the car and check the reading at the battery with car running. It shouldn't keep drop, it should stay about the same or get higher. NOT DROP.

If it drops check your alternator connections.
 

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