Do you have a link to the exact reg/rec you bought from Rick's? There is a good chance they may have lumped the 750 twin in with other Kz750's or 400 twins. But without some re-configuring of wires or components, a reg/rec for a 76 Kz750 twin will not be a direct swap to any other non-early (76 -77) 750 twin or any other Kz.
Here is a post with a bare bones diagram to make it a little easier to read. It also briefly explains why the 76-77 750-twin charging system is unique.
kzrider.com/forum/4-electrical/605868-kz...harging-issue#761383
So if you want to keep the wiring stock and use a plug-n-play reg/rec, you need to find a reg/rec designed to control a field-coil type alternator (aka excited-field, similar to what cars use). The other detail is that the control wire from the reg/rec to the field-coil will have to supply ground to the field-coil (as opposed to providing +12v which is what other Kz's with field-coils do).
Converting to the wiring configuration and reg/rec found on most Kz400's and 77 Kz650's is relatively simple. It's a matter of swapping a couple wires around.
And a third possibility may be to convert over to the more modern permanent-magnet type alternator and reg/rec system found on 78 and later Kz750 twins.
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