Maybe you can make a drawing ?
Well, the problem is that all I actually *DID* was make a drawing, but I can't find it :-)
I have however made another suggestion, this time only using two relays
One of the fog-lamps must be disconnected from chassis-ground, and wired up with two wires.
The other can remain as it is, except its 12V feed must be connected to the new circuitry.
The flashing signal is taken from the connector at the steering wheel, and its connection to the rest of the car disconnected. It should be '25' on the wiring diagram, but I am a little confused, as it might also be '22'. (?) - On the diagram, it is however '25' which is marked at the foglights themselves, nomatter what's going on arounf the dashboard
We need:
R1: normal single contact relay
R2: double pole double throw relay - do DPDT automotive relays exist ? - I have several for normal electronics (Eg a Siemens V23154)
R1 is actually only there to facilitate flashing with the ignition and lights off.
The diagram does NOT implement daytime driving lights, but is only concerned about the switch between serial and parallel operation of the foglamps.
The generator-controlled 12V feed from HRU's original design would simply connect to the upper left "12V feed" point. My thoughts for such automatics also included some time-delay, so the lights would go on say 5 seconds after the generator starts producing power.
One warning however is that one should be careful about taking any signal from the charge-lamp, as that and I think a small resistor in the dashboard makes up an important part of the altenator circuit. Faults may cause the generator to not charge at all.
Maybe the best solution to all this is a electronic thyristor control ?
/Lennart