Are you using the "P" terminal on the flasher?
If so, what is it connected to? That is likely your problem.
The SignalStat 800 does not support that connection, but you could use it to a separately mounted indicator bulb or LED on your dash somewhere.
'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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