Why only left turning signal not blinking only when headlights on? green arrow pointing left seen but not blinking.
When headlights off, both turning signals work perfectly,
Nissan, Frontier 2000, Manual shift, turning signals work perfectly except when headlights on, and only left turning signal not blinking, bulbs, fuses checked and ok, turning signal macho replaced and problem not fixed
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It is hard to say for certain without knowing the year, make, and model of the vehicle, but I would look for wiring problems in the steering column and blinker switch, especially if the headlights and blinkers are both controlled from that location.
If you have the owner's manual, check the chart showing which fuse is for the dash lights and that alarm. Try replacing that/those fuse(s) to see if you're back in working order. (Not sure where your fuse panel would be, but try the area under the dashboard on the driver's side.)
this sounds like a earthing problem , so check the wiring for the head lights, see if any wires are trapped between something, bare wire touching car body , anythingthat doesn't look correct, could also be the indicator lever itself with a problem , but check the headlight wiring first
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.