Okay I will stay clear from Iraggi then. Thanks for the advice (both).
Since I lack technical skills, I don't dare to take out the alternator myself, but I received the following information from a person on a Lexus forum in the UK:
Quote:
Is this what you want this is the one for My IS220d
27060-26030 12V 130amp
not sure on make but they are usually Denso units As TOYOTA Own Nippon Denso
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Tirefryr I don't know if it's usefull or not?
And regarding that 130A should be enough; well to be honest, my old setup already caused problems (not enough power, batteries drained, etc.) so I really doubt the 130A will be enough. Also they didn't put a 130A alternor in my car for my car hifi.

The Lexus has a lot of electrical systems, so I really think I need to upgrade my alternator. :S