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I have it too with my 2003 Tahoe with a 270A six phase hairpin from singer. I believe it's because it charges at a higher voltage than OEM alts

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But you also say yours is externally regulated and you have it at 15v? Try turning it down to like 14 even to see if it will clear it after a little bit. I can't do that with mine

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Set it to 13.8 or around there. Then turn the engine off, disconnect the battery ground to clear the pcm of any fault codes, connect it back and see what that does

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Another thing to do is throughly clean all stock grounds. That can cause the message to pop too, but seeing as both of ours came up after installing HO alts, it's more than likely the high voltage. My voltage sits at 14.9 idle no load, 14.6 full tilt idle.

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