70 510 Turn signal working strong on 1 side only

[Labubre]

Hi,

70 european 1600/510 sss

Probably 68/69 wiring diagrams

Got the car for few month and passed local MOT with success.

Lights were OK, turn signal were OK.

Following seat belts installation (front/rear), i realized i have lost turn signal on passenger side front & rear. Also lost the fuel gauge indicator that was working for sure.

When passenger (right) side turn signal is activated, light is not even flashing on instrument panel and i got a low blinking frequency sound but no lights, whereas for driver side got all lights and can hear a high blinking frequency sound

Test done on turn signals:

- change all rear bulbs -> no effect

- exchange driver/passenger tail light harness -> no effect

- clean fuse box and change all fuses -> no effect

- uninstall combination switch and clean everything up to connector -> nothing

This afternoon while the car was in the dark, i could see a weak light on passenger/front directional and side directional light. Bulb are OK but very weak signal i could missed at daylight! But the passenger/tail light remains OFF.

 

Looking for ideas to test to keep me busy on November 1st!

 

Thanks

Seb