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I am having a problem with my 84 Z28.For some reason the battery is going dead.If I put it on the charger for a while it starts and runs fine but the next morning it is dead again.How can I troubleshoot this problem?I do have a digital meter but dont know where to start.Thanks very much for any help.
Tony
 
Out here we have Kragen Auto Stores. They are part of the Kragen Schucks auto group. Those are the guys who sponsor the funny car. You can take your car in and they will hook up a tester and tell you exactly what to replace...and it's free!!

You clearly have either a bad alternator or a bad regulator. The battery is running the car and not getting charged which is why it goes dead after a while. If you can't get someone to test it for you remove the regulator and have them test it at the local auto supply. It sounds like a simple problem.
Chuck


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Chuck Bonasera
Nor-Cal ChevelleCaminos
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TThe best way to check if your alternator is bad, is to start the car and disconnect the positive cable. If the car stalls you know you alternator/regulator is shot. If the car stays running it's ether your battery is junk or you might have a short in the system.
 
With a charged battery and everything turned off, remove one of the battery cables and put your meter in series (one lead on battery post and the other on battery cable)
there should be very little current flow .4 amps or less (I think)
If there is more amp draw, then something is "on" or the alternator is bad
I would start by disconnecting the Alternator after making sure everything is "off" then recheck.

I personally wouldn't run the engine with a battery cable disconnected ever again
We used to do that with the old generators but the last time I tried it, I burned out stuff cause the voltage went wild and had no place to go I guess


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Dean Call
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Love your enemies. It will drive them nuts
 
Check the simple things first like a trunk light or glove box light that is staying on.

Disconnect your battery overnight. If it still has a charge in the morning you have "someting killing it". If it's dead in the morning you know it's a bad battery.

My neighbor was going crazy with this same problem on his 78 Vette. As I walked by his car one evening I noticed light around his glove box door. Problem solved...

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Bill Taylor
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December 1999 Feature Car
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Have the battery load tested at a local parts store. It could be a dead cell in the battery itself. Or wait for it to die then check it with your meter. A battery reading 12.0 volts is "discharged" It should read about 12.7 volts. Or check with the car running, DO NOT disconnect the battery cable. Charge voltage should be around 14.5 volts or so. To check the regulator, rev the engine with the meter still connected, if the reading goes thru the roof, it's the regulator. Hope this helps.
 
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If you find that the alternator isn't the culprit & your battery is good, & you're down to checking for & finding a current draw as described previously with everything off/closed (trunk, hood, doors, glovebox, etc.), you can pull fuses one by one until the current draw stops. The removal of the fuse that stops the draw is the circuit where the short is. That will at least narrow it down for additional searching. The last problem I had like this was the 4-way flasher switch in the column of my '67. It wasn't all the way on or off, just enough to draw "juice". I used a small test light, since I don't have a meter. I've also had door jam switches (courtesy/dome light) do that to me also. They provide a ground to make the lights come on & mine was a small short- not enough to light the dome light, but enough to discharge the battery. Another culprit was the cigarrette lighter, which seems to be a popular place for prior owners to splice things in, from CB radios to you name it. One more thing, if you have a radio with a clock, etc. that has battery power going to it all the time, it might be one more place to look. Good Luck & let us know what you find. Odie.
 
Discussion starter · #9 ·
Thanks very much everyone for your help,I appreciate it very much.I am going to have to put this on the back burner for a couple days because of the storm we are having up here.As soon as I find (hopefully) the problem I will post what the cause was.
Tony
 
Had the same problem and went through all the general things that could be draining the battery....ie trunk light, door switched, etc. Also traced all wire connections by using a circuit light. Just attach the ground clip to a good ground under hood and probe until you find an open circuit (the light will come on if you find an open circuit). The way I found the problem however was quite by accident. While disconnecting the ground cable to the battery and reconnecting again I heard a clicking noise. I kept touching the ground cable to the negative ground post time and again until I traced the tick. The d--n Air Conditioner relay switch was on backwards and there was a low voltage constant drain on my battery. Took about 2 or 3 days to drain it..because it was a low voltage switch. The switch is on the left hand firewall area as you face the front of the car 72 SS Chevelle. maybe you have the same problem????? Anybody worked on your AC lately???
 
NEVER disconnect battery/alternator connections while the engine is running.

You can try to get the alternator tested, but beware, most parts places don't know what they are doing. If they are knowledgeable, the "simple" tests they perform are not enough to really determine if the alternator is to blame. Leaky diodes etc. can go un-noticed by their equipment.

Is the battery good? Even if it's reading ample voltage with the car off, that doesn't mean it can't have a bad cell. This can be one of the most over-looked things at times.

Any aftermarket equipment (like audio) with "memory" wires? Sometimes those can be culprits.

Just some thoughts.
 
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could be the alt is drawing the battery down overnight due to regulator being stuck have had it happen to me try the unhooking the battery overnight and see if that helps
 
I think Dean is on right track here, but Chev-Hell is probably right. Does an 84 have a fuel pump relay? Had another vehicle would start all day but be dead in the morning. Pump relay was stuck on.Just a thought.
 
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