Hi Ajin, and welcome aboard.
Now that is one strange looking beast you have there… Quad headlights in all! I kind of like it!
There defiantly has been some hacking done to your headlight circuitry. These cars, USA versions, all had floor mounted headlight dimmer switches. I wonder if Sweden required stock mounted switching, which meant some after market rewiring had to be performed at the time of import. Perhaps Slantsixdan, our automotive lighting guru here at Slant Six could pitch in here with a little background on the subject.
I would first suspect that the dimmer switch is getting worn, or is dirty, and not making good contact each time it is operated. Try to test it with a test light, or meter to determine if that switch is working properly.
Second: Make sure all the connections in the headlight circuits are tight, clean & corrosion free including the grounding wires located in the front of the car near the headlights. Replace any bad wire, and clean all landing points where these ground wires attach to the body.
Third: Test the operation of any relays that dimmer switch may be controlling. These relays could be located anywhere under the dash or hood due to the non standard headlight configuration you car has.
Also, perhaps the blue, and missing light were set up to flash when turned on independent of the primary factory headlights. I suspect there is a set of blinkers & relays located somewhere also that control these cop lights.
Lastly, get a copy of the Factory Service Manual for your car. These can be found on line, and will make your life much easer when working on your Valiant. Every little thing is covered with great detail on how your car is to work, and how to fix it, as well as electrical wiring diagrams.
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