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hartke 3500 troubles

Through a moment of not paying attention whilst trouble shooting blowing fuses on this unit I neglected to record the wiring for the toroidal transformer. Namely the grey , blue and black wires. Removed them from the voltage selector chasing a possible in the primary. For the life of me I cannot remember where they go and all schematics I have been able to find all contain standard power transformer connections. Please help. Oh and hi and merry christmas