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Discussion Starter #1
Hello all,

I could use some help here. I may have 2 problems here. I may have a bad battery to start with. I have already replaced one Exide battery that I determined bad and the other is looking bad.


I have had an intermittant charge light on my EX. The funny thing, I would get the light and the voltage reading on my CTS gauge for battery would be 12.8 to 13 volts when the light would be on. I troubleshot the problem with the service manual and found nothing wrong yet. Every sonce I went through the troubleshooting proceedure (ABOUT 6 STEPS), the light did not come on anymore. I did put chargers on each battery for a while to give them a full charge, maybe this helped.

Yesterday, I went to start the truck after sitting for like 3 days. The batteries were low and I had to charge them for a while - maybe 20 minutes(I charge them individually after removing one negative battery terminal). The truck started and I drove for 20 minutes and the battery gauge on my CTS showed 13.2 volts and was charging. We came back from the high school football game and when starting the truck, it was sluggish to start from low batteries. I had a battery charge light. It would not go away. It used to go away when intermittant by revving the motor a little and it may even return until driving a while. We had to rush and head home as I saw the battery voltage dropping lower and lower. I got down to around 8.0 volts on my gauge and all out of nowhere... THE ALTINATOR STARTED CHARGING ! ! !

My voltage went up to 12+ to 13 volts and my lights brightened right up like a good truck.

What the heck could be going on here? I do believe I may have another bad Exide battery on the driver side. That company sucks. I called them to see how to warranty the first bad found battery - less than a year old - replaced by the guy I purchased the truck from in Alabama. I had to have the receipt and take it back to the place it was purchased at. What a crock of poop. They must sell junk, in my opinion to not stand behind their product. There is a manufactured date imprinted into the battery. Not just a sticker with tabs to pull off for when it was purchased.


Any ideas would be greatly appreciated. Maybe I have a bad battery and a bad ground somewhere. I don't know.


Thanks in advance,
Mike
 

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For starters... sounds like the alternator is bad.. I'd pull and test it.

Second, did you ever load test the batteries to make sure they were good/bad?

Third, you should always replace in pairs, if one is weaker than the other the older/weaker one will pull down the new one, shortening it's life.

Lastly, you really should disconnect the batteries all the way when charging them.... as they are connected together.

Good luck with the fix!
 

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Discussion Starter #3
...

I know the battery was bad. It has been replaced !

After replacing it, I fired the truck up and the battery charge light was on. I was showing 12.0 volts. After running for some 10 seconds, the light went out and the truck was showing 13+ volts for the battery. I wonder if there is some sort of a delay for the altinator to charge the batteries.


Even after I fired te truck up several times. the charge would be off, and the voltage would not show a charging value until after running for a little while.

Is this normal?



Mike
 

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Discussion Starter #5
You may very well be correct. I have noticed since, that the light no longer comes on. I will see a 12Volt on my gauge for about 4 to 6 seconds and then it climbs right up to 12.8 at idle and makes its way to 13.2 when driving. When I stop at a light, I am at 13 volts.

I will observe over the next few weeks while driving. No long trips planned for a little while to see what happens.


Mike
 

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Lower 13s at idle perhaps but should be near 14 when running. Unless u have accessories on it should typically not go below 13.


Sent from my fone. :)
 

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had an issue with my batt. discharging after two or more days sitting without starting.this was with brand new batteries....I had the alternator replaced and the 10 gage lug connector replaced also because of rust.... no more issues strating.... good luck....
 

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If you haven't fixed the problem yet, you said one battery is dead. Replace both of them, and test your altinator. Not just hook up and see if its getting power, no kidding take it off and run it. You'd be suprised how it reacts. I'd be willing to bet that if you replace your alternator and get new batteries, you'll be fine.
 

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Discussion Starter #10
OK, we have been driving the truck more often now with my sons bug down. He left an interior light on once for about 7 hours and another time overnight that ran the batteries down to not start without help. I overlooked that, even though it seemed like they shoud do better from an interior light.

I believe the altinator will occassionally drain the batteries down also. BTW... Both batteries are new Interstate batteries from Costco, maybe 6 months old.

I purchased a NEW duralast gold lifetime altinator today and installed it.

What I saw before and still see, it I get no voltage charge until the motor runs for about 40 seconds or so. No charge light, just sits around 12.1 Volts. Then I climb to 14.1V at idle.

Is this normal?

I have instructed my son to keep an eye on the volt display and look for the light to come on any.



Mike
 

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That's normal. What you are seeing is the glow plugs running for up to two minutes. Once they turn off the voltage jumps up.
 

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Discussion Starter #12
WOW, I would never had guessed that was going on. But it does make sense. Thanks for your help!

Now to watch to make sure it continues charging properly.

I kept my core, as it was only $5

Should I rebuild it or have it reworked? Not sure if there are parts easily available for these units.


Mike
 

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Discussion Starter #13
The truck has been staying rock solid at 14.0 to 14.1 volts since altinator replacement.



Any word if I am able to rebuild this core, or if it is worth keeping?



Thanks all,
Mike
 

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It is normal to not see a charge until the truck has been running for a short time. I have two powerstrokes and thet both do it. I believe it is because the glow plugs stay on for awhile even though the WTS light is off.
 
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