The fuses are layed out in 2 rows. One is hot at all times. Horn , brake, dome light, everything else, in that row should work with switch off or on.
Sounds like you have a problem somewhere other than the signal switch.
But where? I have power up to the switch with the key off so that tells me everything is OK up to that point including the fuse box. (Nice bright test light I might add) Dome light works, hazards, horn are all OK. Plus, the brake lights work when the engine is running.
How would or what could change the condition of that particular circuit when the ignition is on?
