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It is impossible to have 17.5 at the battery with 7.8-8.2 at the alternator.

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Those are blue wire ign1 field terminal readings as opposed to a alt batt stud reading and they are low cuz they were taken at idle (alt ain't puttin out) whereas at a higher RPM the field terminal (blue wire circuit) voltage readings would be in the 17+ range (as would the entire electrical system) from the alt putting out what it is capable of & the bad (full fielded) reg telling/allowing it to put out all it can.

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Ok he didn't specify that, but if so,
1. he is losing 1V between the alt and reg.
2.The ign side of the reg should be close to battery V or 17V,

You say the readings are low because the alt is at idle and not putting out yet his battery V is 17+ ????