> Vpp with target connected is 14.06v, without is 14.12

That is OK, but something else is wrong (or worse: marginal). Sorry,
without a scope on your hardware (that I can see for myself) I am out of
suggestions.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products

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