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  • battery keeps dying

    hello,

    problem started a few weeks ago.i was going to walmart and i noticed the truck a tiny bit sluggish.i put on the AC and it was not really cold and lacking a lot.so i stopped to shop with wife and came out after being in there a few hours and my truck was dead.it turned over a half turn each time i tried and then nothing.if i turned my truck in the on position the gauges would go crazy.but barley any volts. and when i looked under hood seeing if there was a loose connection i noticed my neg battery cable was really hot and had a slight smell of sulfur from it.so i tried to jump it for a while and it seemed like it wanted to go but every time i turned the key everything would die out.so i tested battery and they said it had a dead cell and only showing 9volts.so i purchased a used one from a junk yard and it started right away.showing 14 volts on the gauge.i only used it 2 times in the past week.and yesterday when i would drive the volts would drop from 14 to one line under.when i was at idle it would go back to 14V.i had nothing on,not the radio,ac, or anything.so i parked car at my and went to start it the next day and nothing.the under hood light is so dim its barley noticeable.everything drained again.the first 2 times i started it it started but seemed like a weak start.but once it was on it seemed fine.
    does anyone have any ideas.is there a way autozone/advance could check my alternator if i brought it in.and how accurate would that be.thanks

  • #2
    Re: battery keeps dying

    1998 gmc Yukon slt 5.7l 4x4

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    • #3
      Re: battery keeps dying

      Originally posted by laprodigy001 View Post
      is there a way autozone/advance could check my alternator if i brought it in.and how accurate would that be.thanks
      Why don't you check it yourself? Have the truck running. Turn everything on, radio, a/c, wipers, lights, high beams, hazard flashers, and put a multimeter on the battery. It should be 13volts or above. If that checks out good, unhook the positive battery cable, the alternator should keep the truck running, if it dies it's either too small or bad.
      Jeff

      '88 Chevy K3500, aluminum head roller cam 511in³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap

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      • #4
        Re: battery keeps dying

        Originally posted by bowtie44s View Post
        Why don't you check it yourself? Have the truck running. Turn everything on, radio, a/c, wipers, lights, high beams, hazard flashers, and put a multimeter on the battery. It should be 13volts or above. If that checks out good, unhook the positive battery cable, the alternator should keep the truck running, if it dies it's either too small or bad.



        Why do you keep telling people to do this? It was somewhat valid on vehicles equipped with DC generators, led to mis-diagnosis on vehicles with alternators, and can become very expensive on vehicles equipped with computer-controlled emission systems.

        Feel free to blindly poke, unhook, probe, and jumper anything on your own vehicle, but for the love of all things four-stroke, stop telling other people to do the same.

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        • #5
          Re: battery keeps dying

          have it bench tested. you could have a bad diode in there. also check/clean all your grounds. if all is good then i would do a draw test.

          good luck

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          • #6
            Re: battery keeps dying

            Originally posted by bowtie44s View Post
            unhook the positive battery cable, the alternator should keep the truck running, if it dies it's either too small or bad.
            very bad advice...

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            • #7
              Re: battery keeps dying

              Originally posted by AZRon View Post
              Why do you keep telling people to do this?
              Because it works. I have done it on probably a dozen computer controlled vehicles. Engine keeps running if the alternator is good. Have you done it and seen it didn't work? If not don't say it doesn't work.
              Jeff

              '88 Chevy K3500, aluminum head roller cam 511in³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap

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              • #8
                Re: battery keeps dying

                I will be getting my alternator and battery tested at advance auto tomorrow and I will try and jump it after and see what happends.

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                • #9
                  Re: battery keeps dying

                  Originally posted by bowtie44s View Post
                  Because it works. I have done it on probably a dozen computer controlled vehicles. Engine keeps running if the alternator is good. Have you done it and seen it didn't work? If not don't say it doesn't work.

                  your battery is the primary voltage regulator in the circuit, without it the voltage from the alt will spike to dangerous levels for all the electronics in the system.
                  04 Avalanche Z71
                  87 Firebird, 07 Monte Carlo lt, 08 lucerne cxl
                  some previous; 99 GMC Yukon SLE, 89 350/5spd, 04 550 cclwb, 03 2500hd ccsb, 06 2500hd eclb, 03 sclb 2500hd

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                  • #10
                    Re: battery keeps dying

                    Originally posted by laprodigy001 View Post
                    I will be getting my alternator and battery tested at advance auto tomorrow and I will try and jump it after and see what happends.
                    you had one bad battery and likely another from the junk yard, they dont like to sit around and will go bad with no float charge. you also need to clean your battery terminals especially if you say you saw carbon or smoke. you need to clean both ends of each wire and make sure that pos braid is good. i replaced mine with real wire because it disintegrated in my hand
                    04 Avalanche Z71
                    87 Firebird, 07 Monte Carlo lt, 08 lucerne cxl
                    some previous; 99 GMC Yukon SLE, 89 350/5spd, 04 550 cclwb, 03 2500hd ccsb, 06 2500hd eclb, 03 sclb 2500hd

                    Comment


                    • #11
                      Re: battery keeps dying

                      I looked in the back of my alternator and I notices yellowish dust on the back fins.also all the yellowish dust is on som e of the wires around there.what could that be.I will try and get a pic

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                      • #12
                        Re: battery keeps dying

                        could just be pollen or something, corrosion is local to the connection itself. i would clean your connections then after the trucks been running a while at idle with the accessories on should be around 13.5v at the battery with a meter
                        04 Avalanche Z71
                        87 Firebird, 07 Monte Carlo lt, 08 lucerne cxl
                        some previous; 99 GMC Yukon SLE, 89 350/5spd, 04 550 cclwb, 03 2500hd ccsb, 06 2500hd eclb, 03 sclb 2500hd

                        Comment


                        • #13
                          Re: battery keeps dying

                          Truck jumped started right away.put a volt meter to it and it was read 13.8v.I put a load on it and it was still reading 13.does that mean my alt good.and what should the volts be when truck is off.

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                          • #14
                            Re: battery keeps dying

                            When I turned the truck off it was 12.45v...its been about 2 hours now and I just checked it and it reads 12.12v.....is that a normal drop in 2 hours.if the battery is messed up could it not hold a charge and drain over night.

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                            • #15
                              Re: battery keeps dying

                              Originally posted by ToyHauler View Post
                              your battery is the primary voltage regulator in the circuit, without it the voltage from the alt will spike to dangerous levels for all the electronics in the system.
                              I can buy that because the gauge does jump all over the place although I have done it on over a dozen carbureted and computer controlled vehicles and have never had a problem and it let me find a few dead alternators. The multimeter on the battery won't hurt anything though.
                              Jeff

                              '88 Chevy K3500, aluminum head roller cam 511in³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap

                              Comment

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