Rainman,
Hanging lots of lights on the wiring harness is never a good idea, the standard Automotive wiring is generally good for around 17 Amps. to find out the current drawn by a bulb just divide the power rating by the voltage i.e. 60Watts/12 = 5 Amps. It's better to control your driving lamps, that are being linked to your main beam, via a relay. You will need to run a supply wire from your main beam circuit to energise a relay (terminal 85 with a neutral (ground) run to terminal 86). A fused supply will then be taken from your battery and run, through the relay(terminals 30 & 87), to the driving lights. This will allow the Driving lights to come on with main beam.
If you want to be able to control the Fog lights independently just follow the sample install that came with the Motoswitch.
......I'll draw a diagram and post it, it sounds much worse than it is.
Mr Farmer indeed, I feel like I'm about to be arrested...