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Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.working after noon till just after midnight.
This is the wire diagram I will be using.
As long as the multifunction switch is getting both powers and the ground then the hazard light issue should be a faulty flasher built into the switch, meaning a new switch is needed.
Unplug both rear lamps. Turn the key on and the right turn. In the rear the only wire which should be pulsing power is the right brown/red wire. If you get that result then plug that lamp back in and check the right white/yellow wire if it is pulsing then you have a faulty connector, bulb socket, or shorted filament inside the bulb. Let me know these test results if you get something different.
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Hello again Chris here,