..This has confused me about the discussion, because my experience was that a poor ground or open bulb created a slow blinker---since for thermostatic types of blinkers, the current draw heats the relay internally, causing the bimetallic to switch off...And this is just the opposite of what you are seeing, but no matter---if the blinker is looking for current, he's going to find more of it in Hazard mode. In my world, the hazard would be "On" for half the time as in turn-indicator, but the cool down-time of the bimetallic not change.
In my world of thermostatic blinkers, though, there is no ground at the blinker: bright bulbs everywhere are all that is needed, the only ground that matters is the ground at the bulbs (as these cause the current needed for the heater in the relay). This is the Mangusta and maybe early Pantera. But the new-fangled Pantera blinker shows a ground. So if its measuring current, well, could be that it is working just fine. If it is instead a simple timer (as I'd expect all modern blinker relays), only then is this a mystery !
At least from the schematic, the dimmer is irrelevant to the circuit when the hazard button is pressed; unpressed, the bulb in the dimmer switch is just following the other gauge bulbs, which won't have any power at all if the lights are off. When pushed, the bulb at the switch just becomes another load that affects the timing...and then only somewhat (its only the ant on the ant hill...)
My suggestion---don't press the hazard switch, and everything will be OK 
Lee