I'm no help, but I hope you get your answer. My best guess would be it needs a DC-DC up-converter to 120+ volts.
Here's a question I posed in another thread*:
Quote:
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Do you know if the GS450h/LS600h uses the Interchange Part Number: 300-65002?
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I've got one of these sitting on a bench.
*
ecomodder.com/forum: Hot-rodding the Toyota MGR