Check brake switch located on driver side just under your power steering column, it has two electric cables, see if any of them are interrupted making pull test, check switch continuity with an ohmmeter if possible.
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Your turn signal lights and brake lights are the same lights . Question : do the front parking lights work ? The front and rear running lights or parking lights are all on the same circuit and fuse . If the front lights work , and the rear lights don't , make sure the bulbs are good first . If OK , I would suspect the problem is either a bad ground in the rear taillight wiring harness or a bad connection in the rear taillight connector Itself .
Ok. First of all, chk all the bulbs. Well at least the four parking lamps. The ones that are supposed to flash. One or two are burnd out. It happens. The flasher(s) work on resistance and that is provided by the bulbs.Brake likes and the turn signals are electrically associated.and you already said one side does not work, so let's start with bulb inspection Let me know
What may have happened is either the headlights wiring or the parking lights wiring somewhere along the wiring fused to the left turn signals wiring. Depending on if the turn signals go on when you put the parking lights on or the headlights on.
If the signals come on when you turn on the headlights than you only need to locate the light green wire that comes off the left turn signal harness.
Next follow that wire the entire way back to the firewall looking for another wire fused to that wire as you go.
If there are no signs of this you need to continue looking on the other side of the firewall all the way back to the turn signal and hazard flasher unit which is a black box that connects to a black harness located next to a grey harness behind the knee bolster.
But if the signals come on when you turn on the parking lights than you will also need to check the wiring from the rear left signal and follow that light green wire all the way back to the turn signal and hazard flasher unit.
This should fix your problem, but if not than your problem may lay within the the wiring between the turn signal/hazard switches and the turn signal and hazard flasher unit.
Also you may have a burnt circuit in the junction block. This block is where the light green from the rear left signal and front left signal meet. Don't have a description but if you cannot find it let me know and I will go out to the yard and look myself and let you know.
Just a thought. I have a 98 626 5 speed. When the hand brake is applied the head lights go out but the marker lights stay on. Might be a switch issue with the hand brake...worth a look. The sensor should be located at the pivot point for the brake handle.