Help!! My 110 3.5 1987 have start issues

Hi

My 110 3.5 1987 have always started without any problems.
All of a sudden it startet acting like this:
1. When i turn the key to start, the battery light are on, nothing unusual in this
2. When I turn the next step key to start, nothings happens but the fog light and driving light flashes in the panel (se picture)
3. I have unplugged the light and fog light contact now, and the engine will start, but the light and fog light still flashes in the panel.
4. 3. I have changed the Light contact to a new, and now the car can only start if the light is off, and the foglight are still flashing in the panel.

What to do??? any help are appreciated.

Sounds like there's a short between the ignition key wiring circuits and the light/fog light circuits, so you'll need to find this short. Start with the logical points where the two circuits are physically close to each other, then work backwards with your DVM using either ohms/continuity or 12v with power on. Also, do be patient when fault tracing as it can be a little frustrating...just work methodically testing all wires and components in each of the three circuits. Good luck...

does your oil warning lamp illuminated when is ignition switched on and go out with engine running the reason for asking is the voltage transformer or in other words the dim/dip relay
is activated by the oil pressure switch which intern controls rear fog and headlights ,so relay could be faulty or oil pressure switch