Yeah I think that's it but not sure how to isolate and fixA poor earth possibly.
Yeah I've cleaned them and bent them out, one passenger side always works regardless of socket, the driver's side won't work even when switch the sockets, that's why I'm thinking it's a ground problem.Bend the tabs out on the socket and clean the tabs in the headlight assuming that they haven’t broken off in the headlight
Take a photo of inside the headlight hole the headlight only has one earth so if the headlight works the earth is okYeah I've cleaned them and bent them out, one passenger side always works regardless of socket, the driver's side won't work even when switch the sockets, that's why I'm thinking it's a ground problem.
Take a photo of inside the headlight hole
As I said the headlight only has one earth if the headlight works the earth is okPossibly the headlight connector layout is like this, where three of the pins (not all relevant to your problem) lead to earth via two crimps and two bolted earth points.
View attachment 136974
headlight works, ill will have to look up how to use the mulitmeter, it's been a while.Gecko has NOT yet said if the headlight on that side is working. That is a key diagnostic. If the headlight works, then the earth is OK. If the headlight doesn't work, it is likely to be the earth.
IF the headlight works... I'd be getting out a multi meter. Put the blinker on. Test you have flashing 12 volts when you put the meter probes on the earth contact and the blinker contact of the bulb holder. If nothing, test from the blinker bulb centre contact to a real earth (a bolt attached to the body) or to the battery negative terminal. If still nothing, you have a wiring fault - likely to be in the plug/socket, unless mice have been eating your wiring.
If you don't have a multi meter, buy one. Jaycar Electronics have good cheap ones. Also getting a pair of multimeter leads with clip ends is good. You can then fit the black clip lead and a red probe lead to the meter. Connect the black clip to a known good earth or to battery negative, then test for (flashing) 12 volts at the centre bulb contact, using the probe of the red lead. If nothing, then open up the connector and test for flashing 12 volts at the connector pins - the car side of course. If you don't have flashing 12 volts at the wiring connector (but you will) then you have a wiring fault. But as Dmccurtayne said, it will be connector problems or bulb holder problems. Use the multimeter to find out where you have flashing 12 volts and where you don't, that will give you your answer.
Thank you I'll take a look at that if problem comes up again, I suspect it might be rain related. Those pictures and instructions are very well laid out.As has been mentioned, this is an "old" defect and I offer a possible "old" solution, from Peugeotlogic:
Front indicators not workingPeugeot 307