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FU2 is the voltage regulator Fuse I believe. I don't have the manuals in front of me now. Some models have the FU2 fuse and some of the older models do not. It would be located to the left of the voltage regulator mounted right beside it.
From glancing over the thread, it appears you have 120volts when the master switch is in the start position and as soon as you let it go, the voltage drops to 0 or 37volts. Is this correct? If so, more than likely the Voltage Regulator has failed and you will need a replacement.