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Do you have brake and parkng lights? The turnsignal switch on the column is just designed to relay a path to the flasher and then it is designed to interupt the brake and some of the parking lights lights, which cause the flashing on and off. Double check fuses double check bulb socks and bulbs for good contacts. Does the 4 ways work? If the lights all flash then locate the turn signal flasher and switch with emergency flasher if possible to rule out relay. If those are all good and the emergency flasher lights work and bulbs, then you would have a problem with the turn signal switch. Hope this all helps
The fuse is always the first thing to check, then put turn signal on (and ignition on) step out side and see if the front or rear bulbs turn on but don't flash. Turn on emergency flashers on, do they work? If not could be the flasher relay. Brake lights are trigered by a switch under the brake pedal or wired to the brake master cylinder.
Check your fuses of course,you probably did.Listen your not going to believe this,the wire at the brake light switch can be bad.sometines the wire can break inside the vinyl cover just a milameter.use a test light for presence of voltage at the switch and check a few inches back to see it voltage is present. MAKE SURE YOU HAVE VOLTAGE AT THE SWITCH!
I would check the bulbs, first with just parking lights on - making sure all light - then to see if brake lights work.
If brake lights work, check you parking/signal lights, as they may be of the "two filament" variety. If this is the case, and they are not burned out, check to make sure that the FLASHER module works and that the button for the EMER FLASHER works.
If either is not working, neither will your turn signals, as they depend on the flasher module.
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.
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