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Defective B+ battery cable from Alternator to battery
Poor Charging System ground(s)
Defective PCM wiring/connection to Alternator
Defective Voltage Regulator
Large Parasitic battery drain
Defective Battery and/or cables
Check the condition of your battery cables - are they corroded/have broken wire strands? Also check where the negative battery lead attaches to the engine/bodywork.
Check all the wiring for breaks and tightness - a small earth wire can be loosened and retightened to create a better earth. Corroded power wires can struggle to supply the correct voltage - remove and clean whatever you can find.
It's unlikely to be your alternator as you say it has been checked - the voltage regulator is built into the alternator so it must be okay.
A parasitic drain can be difficult to find. Try switching off everything - radio, heater ... the next time you start the car. If you know somebody who has a voltmeter and knows how to check for a power drain .. ask them.
The link below shows a Saturn PCM (it may not be your actual model..). Check all wiring around the PCM
It sounds like an Alternator problem.
Remember the Battery only Starts the vehicle and runs nominal operations. The Alternator actually provides the electricity to run the Engine operations. With that being said: Start the vehicle, jump start it if you have to. Remove the Negative Cable from the Battery or remove the jumper cables. If the Engine dies after doing this, the Alternaotr is bad and needs to be replaced. When the Alternator begins to die, it starts draining the Battery. During normal operation it is the Alternator that sends a small trickle charge back to the Battery keeping it charged-up.
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Yes, you can jumpstart the Swift. Anytime you jumpstart a car, please be cautious.
Because of the dangers inherent with jump starting a car battery, we highly recommend using jumper cables specifically designed to help eliminate the possibility of an explosion. CAUTION: Lead acid batteries generate explosive hydrogen gases. Keep sparks, flames, and lighted cigarettes away from the area. Cables should only be connected to batteries with the same voltage ratings. That is... both batteries should either be 6-volt or 12 volt batteries. If for any reason acid contacts eyes, skin, or clothing, FLUSH immediately with large amounts of water. In case of eye contact, see a physician immediately. Note: If the battery is cracked or appears to be leaking fluids... it's time for a new battery. Be careful as the fluid coming out of the vehicles battery can cause damage to you and or your car/truck.
sounds like a bad ground somewhere. that can burn out power wires due to a high amp draw and cause the battery not to charge. try hooking up the negitive cable directly to the engine to jumpstart it. if that works and the car dies as soon as you disconnect the cables a bad ground is very likely. and I have noticed the new gms are very weak in the charging/battery department. They are using very cheep batterys ,die very easy. also check fuses.