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Hi there, hope somebody can please please help !

I have a 2007 skyline 350GT, and about 3x weeks ago, had the battery die and alternator die. Here started my problems, as i've now had the battery replaced and a genuine alternator fitted, and the same thing happened again. And again, and again today.

My mechanic has told me the new battery is the right size and is a heavy duty battery, yet the battery light still has come on again after picking my car up the first time the alternator and battery were replaced. The second time it happened, the mechanic ordered another alternator and this is installed now. I picked up the car last friday and the next day the batter light came on again - this time i took the car straight back to the mechanic and by doing this early, it appears i saved the current alternator from dying. I dont have an aftermarket sound system fitted, but i did get an amp and two rear speakers fitted last year (curiously, my skyline is the S model but doesnt have the BOSE system, and had no rear speakers, just holes) So i had an amp fitted and two back speakers. I've had no issues for over a year, but the mechanic thinks as the amp was connected to the battery, that this might be the cause of the issue. So he disconnected the amp yesterday - i got my car back with no amp connected to the battery, and today the battery light is on again .... back to the mechanic again for me ... the mechanic thinks this might be a computer issue ,but i've never had this issue for the 2 years ive had the car ... im just really lost here, and was hoping someone could help me - what type of battery do i need for this car, so i can let the mechanic know *(just to double check we have the right size in there)* - do you guys have any ideas that might help me ? Please help if you can ! Cheers, Paul...

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Batteries are not rocket science. You get what fits in the space provided (I run an Optima yellow top, seven years old and still kicking on strong).

Before going to the extremes of computers and whatnot, has your mechanic actually checked the wiring and relevant fuses with a proper meter? I seriously doubt it, which is why I question your mechanic's electrical knowledge.

I say find a real auto electrician to work out what's going on before you spend thousands for nothing.

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