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Re: Starting problem
A common problem with the S4 is voltage drop across the charging circuit. The last S4 I worked on had 13.7v at the alternator but only 12.4 at the battery! This car had the same symptoms; flat battery after a few days but would start right up with a jump. The fix was to clean the connections at the alternator B+ terminal, junction box on left inner wing, starter and battery. Voltage at the battery went up to that of the alternator. No problems now for a couple of months.
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