I've replaced the battery and the altanator

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Originally Posted by lilsims

ive replaced the battery and the altanator

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If you've verified power and ground as well as continuity in the harness, there's still an external voltage regulator (mounted under center of dash panel) that could be your problem.

. Check all under hood fuses with a test light or multimeter, especially any "mega fuse" where the alternator "B" wire attaches to the fuse box.

. Install a new voltage regulator, being sure to create a "soft" spark to establish polarity. Follow the directions explicitly that come with the new regulator; otherwise, the new regulator won't work.