fog lamp relay wiring

Hello all, please excuse me if this has been covered.  I have been searching this site for hours but can't seem to pinpoint exactly what I need.  I am wiring new fog lamps.  I don't need a switch as I will just leave them on when headlamps are on.  I just need the fog lamps to have power when low beams are on and no power when high beams are on (low beams stay on with high beams in this vehicle).  Here is what I've figured out so far:

SPDT Relay:

pin 85: +12VDC lead from high beampin 86: groundpin 30: fused +12VDC 10Apin 87: not usedpin 87a: positive lead to fog lamps

Please advise.  Thanks in advance for any assistance!

As long as terminal 30 only has power when the lights are on, it will work. 

Ah, this is a good point and an oversight on my part.  I was going to use a fused constant +12VDC for pin 30.  I could power the fog lamps on the same circuit as the low beams by running the +12VDC lead from the low beams to pin 30 in order to prevent the fog lamps from having power without the headlamps on.  I'd rather have fog lamps on their own circuit.  Is there a single relay that can do this or do I need an additional relay here?  Thanks!

what kind of vehicle do you have?This information is provided only as a reference.

All circuits should be verified with a digital multi-meter prior to making any connections.

It is a 2011 Chevrolet Equinox.

The idea is correct, keep that constant 10amp feed to 30 and the switched low beam output to 86 (not 85 no difference in practice but ISO convention states that 86 is the + side and 85 the - side of the coil). Ground to 85 Here's where you went wrong. 87 to foglights. On a 5 pin relay 87a is normally closed (NC) and is connected (continuous with) 30 until the relay coil is triggered then 87 becomes connected (87 = NO). 87a, NOT USED That's why a 4 pin switches and a 5 pin switches and changes over hence Single Pole Change Over or SPCO. Sorry I was so long winded. The way you had the relay wired the lights would have been on all the time. Some one posting above should have known better.

I have no idea who Howie is talking about that should have known better. 

Howie's way will have your fogs on along with the high beams.  That will probably = a ticket. 

I wouid not tax the low beam circuit with the additional current of the fogs.  This will take an additional relay.  Wire the additional relay as follows.  85 to ground.  86 to low beam positive wire.  30 fused at the battery.  87 of second relay to 30 of the original relay. 

Craig, the way I suggested it the low beam simply triggered the relay coil. I admit I should have stated pin 30 12V+ Constant from battery or fuse box input.

It will NOT bring the fogs on with the high beams unless they currently come on together which is not going to happen if the original factory wiring is adhered to. The fact that they are triggered from the low beam ensures they will only come on when the low beams are in operation which at least makes them legal here in the UK.

In his initial post he stated that the lows remain on when the highs are lit.