When turning on my Subaru Legacy outback 2003 (at daily first start up), the battery lamp on its panel is lit & it's not turning off in the same time as all other lamps on the panel : it remains ''On'' for minutes (from 0 to 20 minutes), sometimes when giving fuel pulse (speed the engine) before running, it disappears. Noting that when this lamp lit, the ''Brake'' lamp lit also even if the Brake was down, and when it disappears, the ''Brake'' lamp disappears also. When turning On the car after arriving from a trip (when no lamps are On on the Panel), the battery lamp doesn't lit (like if the car is warm, this problem doesn't appear). Please help to solve this Problem as soon as possible. Many thx is advance.
The problem is most likely in the alternator or possably the voltage regulator of the alternator, it is an easy test to run and is done for free at most automotive stores, when the alternator is cold there may be commontator and brush contact issues. the test when it is cold is you can put a voltage testor on the battery and have the scar started cold. the voltage should not drop below 10v f it does have the battery load tested. as soon as the car starts then see if the voltage is around 14.3 or so, if it is below 14 then the alternator or regulator are bad. if it is jumping all over like ya know 12, 15, 7, 14 then the regulator is bad. have them double checked and replaced.
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