you planned 'attack' looks ok to me. Pin #1 (ground) and Pin#3 (12V) will be just 'dandy' to use.

Need to get a pin that will fit nicely into the holes without damaging the pin. Check some surplus electronic houses in your area and look for some old pins from military connectors. You should be able to find one that will fit nicely.

But if a paperclip works, then use it. Would suggest that you solder it and then use a bit of shrink sleeving, so just the tip is exposed; just enough to stick into the pin under test.

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Regards . . . . JimF
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'94 S500 Cpe

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