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Have you had your alternator checked ? If there is no charging from the alternator the "problem" will be solved as long as the new battery retaing its voltage. As soon as you start to use power you drain the battery. it's a bit like putting air into a punchured tyre ..... its still punchured . Could be your original problem ! ! Good luck
There are two problems which might be occurring besides the obvious battery terminals needing to odd wire brushing to expose pure silver lead at the conact posts and inside the post clamps. My 2002 Jetta actually had a crushed wiring harness - Good stuff but it may have been assembled somewhere other than Germany and someone banged the wiring just enough to short or create resistance in the crushed copper. This was solved by a new wiring harness under the hood which also involved the Diesel glow plugs burning up all the time. Second problem may be badly installed diodes in the Alternator. I heard that some have them installed backwards, but only one of them in the group, so of course that would play havock with your charging system even though it will have enough forward power to run your engine. Also the control plug-in wiring on the Alternator sometimes gets salt on it and corrosion then won't let the system be able to get currant to your Alternator to make any power. This is a cheap problem to fix, just buy a new $8 Alternator plug-in and solder it to your wiring cable with good heat shrink wrap insulating tubes and a hair dryer.
SORRY TO TELL YOU WHEN DISCONNECT BATTERY ON VOLKSWAGONS.YOU MUST USE A MEMORY SAVER.IN CIGARETTE LIGHTER.TO KEEP COMPUTER MEMORY.IF YOU DONT.YOU HAVE TO GET A SPECIAL SCANNER TO REPROGRAM CAR LIKE THE DEALERSHIP.
You'll need to disconnect the high and low pressure lines from the compressor. Unplug the electrical connector for the compressor. Remove the belt. Unbolt the compressor from the motor. Reinstall, connect a vacuum pump to the high side A/C fitting, start the vacuum pump, run pump until to have about 15psi of vacuum and then disconnect the pump and refill with refrigeraint.
You may have a bad coil pack - try moving two of them around and see if the misfire follows the coil pack or stays at the same cylinder. If it follows the coil pack, get a new one. If it stays in the same cylinder, inspect your spark plug wires and make sure the plug is gapped correctly.
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