1981-1983 KZ650 FSM. Front cover. back cover. 83 supplement page.
The 81-83 FSM is just the 81-82 service manual plus the 83 supplement page and 83 F4 wiring diagrams.
There isn't a wiring diagram specifically for the KZ650-H3, so you would use the H2 wiring diagram.
I scanned the 83 diagrams as well but didn't bother posting them here. Also, the NOS manual I have is poorer quality
than the earlier manuals as it doesn't have glossy pages and the F4 wiring diagrams are black-&-white.