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If the brake light filaments also act as the flashers you can'y tee off the rear lights, diodes or no. You have to take a feed from the brake light switch or the other end of the wire where it feeds the indicator switch.
Again, this assumes the brake light filaments also act as the flashers.
If the brake lights are separate from the flashers you can just tee off either rear brake light or anywhere in the feed wire to them. Again, no diodes required as the brake lights are connected together anyway.
Mart.