can anyone explain what is in this PIAA relay I have, PH-4FB..

have it sussed to wire it up to come on with full beam, but i want it switched too.. there are two unused terminals in the relay.. what are these for ??

 

I suppose it could be a changeover relay?

Anyway, you can get a second (simple on/off four terminal), relay for about a fiver from Halfords, carshops etc, and use it to "switch" the PIAA relay via the OE foglight switch. Is that what you mean? I've done it, takes about ten minutes and about a metre and a half of wire, plus four spade connectors, covers for them, a scotchlok connector and one ring terminal.
If you want details, PM me.

Alcazar

 

The factory (well Dealers) install wires the PIAA's up to the front Fog switch. It's like that on my RB5.

 

this is the relay (poor quality pic), there are two spade connections that are covered at the moment next to where it says PIAA, what are these connections ?? are they for a switch ??