Ingnition wiring

You are one third of the way there already.

Obviously the terminal marked "bat(tery) +" is exactly that.

One of the remaining two is "ignition position" (to ignition coil).

The one remaining is likely Accessories position ( to non ignition circuits).

If you post the descriptions and numbers on the switch I may be able to help further.

Otherwise meter the switch out with an ohmmeter or a test lamp.

If the switch has a spring return position that will be for the starter solenoid and it won't have an "accessories position".
 
pics:

404switch.jpg 404wiring.jpg
 
Bad Bertie

See attached:
https://www.peugeot404vereniging.nl/docs/Peugeot%20404%20Service%20Manual%20Deel%202%20Pagina%207-1%20tm%20Pagina%2014-5%20Einde.pdfd

Check the wire numbers and connect as in 12-4.

Note: Get a magnifying glass and check the numbers on the back of your switch, you will find that the Batt + terminal is 30, the double terminal is 15 & B and the single terminal is 50.

Good Luck.

I think Red and Yellow wires should be connected to Batt + 30 terminal.

B or 15 terminal connects to the wire from Coil, wire 32.

50 terminal connects to Starter solenoid wire, wire 46.
 
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