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subaru low power to lights and stereoBody grounds, open hood remove clean lightly grease and reinstall all body grounds you can see including engine to body ground

SIGABOT: Bad key-switch contacts. replace key-switch. non-recommended fix; bypass black with red stripe wire from alternator using alligator-clip to positive battery turminal only while car is on, disconnect when car is off.

Wiring diagrams are in the back of Haynes Auto repair manual from auto supply stores.

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Q: Your 91 legacy has trouble powering your stereo and headlights while driving it the alternator is tested and is good and the charge goes on and off?
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