What is wrong with my 1986 porsche 911? Why won't the car battery charge?

gnettx

New member
This car has been serviced regularly and runs beautifully but there is something wrong with the battery charging system. The battery is less than 1 year old but I have to jumpstart the car everytime I drive it. If I drive it every single day then it will usually but not always start but if I let it sit for 2 days or more, it won't. I took it to a porsche mechanic and he says everything is fine with the battery, alternator, charging system but the damn thing wont start. I purchased a trickle charger and hooked that up and IT STILL WON'T START! It starts with jumpstart everytime though. Can anyone tell me where the problem is here?
Will a bad alternator or loose fan belt cause a car battery to not trickle charge? I don't think it is the alternator since once I jumstart the car the car will drive forever without dying although the headlights always dim whenever I accelerate. Plus the mechanic says he checked the alternator and belt and all is okay.
 
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