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[darkhorse737]

11.8volts on idle. hmmm...

bench test proves your alternator is fine.... but the 11.8volt reading tells me that the alternator isn't pushing the 13something volts into your battery.

There's such a thing as an alternator fuse, try and locate that. Also retrace your wiring. if u bench tested your alternator, very possibly you forgot to hook a wire or two back in the right place ;-)