QUOTE(eitnurg @ Nov 10 2014, 02:40 AM)
Generic flasher units may work, or not: but what they will likely have an issue with is the handbrake warning light. When they should flash this light on its own, they just buzz loudly.
If you're happy with that, then fine. I put up with it for a number of years. 'Suck it and see' seems to be the answer.
This is what I'd expect with an electromechanical flasher, or one that flashes 'fast' when presented with a high load impedance (with the parking brake on, the load on the flasher is just the master warning lamps, which looks a lot to a flasher like several blown indicator bulbs).
(At least, per the '72 diagram in front of me...)
= Mike