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Bob,
Just connect +12v to the "B" terminal on the bottom and the battery ground to the "D" ground terminal on the case. You should hear a high-pitched whine, about 2Khz in pitch. That "whine" is the transformer used to step up the voltage from +12v to charge the capacitor.
If you hear that, there's a decent chance it's working. To really test it, you would need to trigger it . . . but you should NOT try that as you will destroy it without the proper load. And don't connect a meter to the CDI, either!
And if Warren (RIP) were here he'd say Do Not Touch the "A" terminal, or you will get a nasty 460 Volt shock!!!!!
Good luck!
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'66 911 #304065 Irischgruen
‘96 993 Carrera 2 Polarsilber
'81 R65
Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13)
Ex-'88 Carrera (Sold 3/29/02)
Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04)
Ex-'89 944 Turbo S (Sold 8/21/20)
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