Hi,
If I understand you right based on your post/description, the signal lights would still turn on even if any or both of the flasher relays are removed. Should this be the case, then the signal lights are not getting the power from the flasher relays but from the brake light circuit.
Perhaps your concern is not with any of the flasher, but simply missing or loose ground more particularly with the rear lights. Perhaps you could try determining which of the wires for the brake lights and signal lights (as they come out of the light assembly) would be ground . A test and even possibly a temporary workaround is to hard wire a second ground connection from the determined ground wire of the lights and attach it to any conveniently located bolt or screw to the body. it may be to your advantage to do this on all the rear lights assembly.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards. Thank you for using FixYa.
SOURCE: signal lights and brake lights stopped working
the multifunction switch (turn signal switch) is a major cuase of this. your high mount stop lamp wire is run through the switch.
SOURCE: Rear turn signals and brake lights won't work
Probably the turn signal switch assembly. This is a common problem with the older Fords. The switch is a self contained unit at a cost of about $100.00.
SOURCE: Emergency Flashers totally out, Rear lights malfunctioning
Check the ground on the passenger side rear lights, it's likely bad. As for the hazards, sounds like a bad flasher or fuse.
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