I have just seen what seemed a very strange fault on a Peugeot 306, S1,
1.9 Diesel.

The car stopped and would not start.  I found there was no electric
power in the car when the ignition was turned to position 1 (or 2 or 3
for that matter).  Then I saw that just occasionally the was the odd
flicker on instrument light at position 1.

When I checked with a meter, I found that there were two +ve supply
wires to the ignition switch, one of them dropped close to 0 volts when
the ignition was turned to position "1".  No disturbance of the wires at
the battery +ve end would make any difference, but giggling the wires at
the ignition switch end would sometimes caused the flicker.  I excluded
the connectors to the ignition switch, the voltage at the loom end of it
was dropping.

After looking at the circuit diagram (well, actually 405 S2 circuit
diagram Haynes BOL) I found that the good supply was for heated rear
window only & the weak one for the rest of the car.  The diagram shows a
single supply from the battery +ve until & then a connection joint to
source the two +ve supply wires to the switch.  Once I understood this,
I could just bridge the two supply wires at the switch to get the car
going.

Has anyone come across the same?  Does anyone know where the connection
in the loom.  I don't really want to remove the console just to see _if_
I can find it!

Regards