If the OT secondary of the host amp IS grounded either independently or via the output jack then the ground lift switch on your load box shouldn't make any difference at all to the circuit operation. So if this is the case there should be no change that would cause your problem when lifting the ground as shown in the schematic above.
Why should lifting the ground from the chassis make any difference to the fan supply?
What is the current rating of the bridge diodes? Is it a molded bridge, or discrete diodes making the bridge. .
Seems like one or more of the negative sides of the bridge are shorted
Basic reactive load read:
https://www.aikenamps.com/index.php/...-load-emulator
https://www.thegearpage.net/board/in...-load.1072793/
https://circuitdigest.com/electronic...nt-rlc-circuit
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