Hi ferk,
Removing battery negative terminals to test charging are old school theory that should NEVER be used for modern days vehicles. If there is a power surge, you could blow/fry some of the delicate electronic components and circuits. A voltmeter should be used to test the charging and since you are into DIY, it would be a handy tool to have.
Flickering of lights could be due to bad grounds and a battery that is not containing full charge. Check the negative cable ground at transmission, between body to engnine at timing belt side and harness at fenders.
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Sunday, January 18th, 2009 AT 1:27 AM