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The alternator has a grounding cable connected to the frame of the car. If it is disconnected or has a corroded or loose connector, the alternator will not charge the battery. You can test this by connecting a temporary ground wire from one of the alternator mounting bolts to a good metal grounding point away from any moving parts. If the battery charges, ...


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"Does the light go out after the engine has run for a while? –  mikes" No, I would have to turn the vehicle off then turn it back on again, but If I let the vehicle warm up for a bit then the light doesnt come on at all.


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With the description you give, I'd say you connected them backwards with about a 99%+ assurance. Large amounts of sparks followed by heat are both VERY BAD SIGNS (as you soon figured out) and almost always mean you have the jumpers on backwards. Never trust what the covers on the battery says. Check what the battery says to be sure. If there is no way to see ...


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The idea isn't to replace the amperage of the battery, but to boost (add to) what charge is available from your battery. The lower amperage output is fairly typical. For this reason and for the simple reason that these devices are made to be portable. If it had the same amperage as the battery in your car, it would weight about the same amount. Since your ...


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The cranking amps required to start an engine are not the same as the cranking amp rating of a battery. I don't know the amps required to start your car's engine, but if it is less than 400 amps, then it will work. Higher cranking amps in a battery yields additional benefits. The battery can be used for more starts because less capacity is used on each ...


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Corrosion on the terminals is due to hydrogen gas being released from the acid in the battery. It mixes with other things in the atmosphere under the hood and produces the corrosion you see on the terminals. Generally, if the corrosion is occurring on the negative terminal, your system is probably undercharging. If on the positive side, it is probably ...


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I think the problem is, one or both of your battery leads are not connected properly. You need to do two things when you installed the new battery. Ensure the leads are completely clean of any type of debris or corrosion. Second, ensure they are tight enough to have a proper and secure connection. I believe the Concorde has side posts on the battery. These ...


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The sound of the clicking is from the starter relay. There is a little bi-metal strip inside of the plastic housing and it's flapping back and forth. It's the same concept as a turn signal, it's just happening more rapidly. It means the voltage on your battery is low. Even though you just drove it, it might not be holding a charge well. Very hot ...


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No, you do not need to disconnect the battery from the vehicle before applying a battery tender. Ensure, however, that you disconnect the battery tender from the vehicle before you go to start it. If you don't, some tenders will self destruct.


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Wow I can't believe the basics are totally not listed here. First of all, since you know its draining the battery, disconnect the battery, charge it, then check to see if it is still draining on its own. Saying that for anyone that hasn't tried that first to double check the battery itself. Then there are the basics. The alternator check: you can use a ...


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It isn't very plausible that the battery was hooked up backwards. I believe what the mechanic was trying to say is that when the jump was attempted, the jumper cables were put on incorrectly and damaged everything. This sounds more than plausible to me. I'm not sure how you applied the jumper cables, but it can be done wrong very easily, especially if you ...


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Yes for the most part an AGM is a drop in replacement for your standard Lead Acid Battery. The charging voltages are almost identical. You are correct that they have a lower internal resistance and can be charged at a much faster rate. This shouldn't cause a problem on the majority of vehicles as the wiring in the car is designed to handle the maximum rated ...


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Engine has no Oil Pressure when in Stop Mode, Start Cycles will wear out stress Bearings faster from low/no Oil Pressure Cycling with very short time to increase Oil Flow. Buy a new Battery, then Starter, then Engine ! EPA does it again.


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First I'd clean your battery terminals, since even a cold battery at fullish charge will try to start. After cleaning, make sure they're clamped tight and there's no corrosion. Also, describe "won't start" - clicks, nothing, slow turnover, turns and stops, etc.


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You should be checking the voltage directly at the battery. Battery voltage measurements need to be precise to tell if the battery is good. Open circuit voltage is as follows. 12.66 = 100% state of charge 12.45 = 75% state of charge 12.24 = 50% state of charge 12.06 = 25% state of charge 11.89 = 0% state of charge 10.45 - 10.65 = bad cell, battery should ...


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More than likely it would show up right away. If it was on before, and now it's off, I'd say the problem's fixed. The codes for what ever triggered the CEL would no longer be present due to the lack of battery power, so you cannot just do a scan on the vehicle. You can, however, check to ensure that battery voltage at rest and while the engine is running are ...



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