Those installation instructions look suspiciously like SignalStat 900 instructions. And with no company name on them, I wonder if they are correct for your unit. Does your unit have a four way flasher switch, Code F in your instructions?
'Bolter HandyAndy installed a (new I think) Yankee Turnflex 730/6 in 2022. Maybe he'll chime in or you could PM him for help.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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