Where to look for leaks on power steer?

[Kiwicommodore]

Got a big leak but not sure from where....

[Kingo]

In no particular order.
Reservoir: could be cracked.
Hoses from/to reservior (rubber ones): could be old, could have a hole, could be leaking at connection.
Hose Clamps: could be shagged.
Hoses from/to pump (metal ones): O-rings in connections could be shagged, hose could have developed a hole.
Pump: Shaft seal gone, rear O-rings could be gone.
Rack: could be shagged, connection O-rings gone etc, rack ends rooted.

You need to find roughly where it is coming from, get under there with a can of degreaser and clean it all up, wipe over all hoses etc.
Take it for a spin around the block, doing a couple of full lock turns in each direction.

Let sit on a level surface, and look for drips.
Have a feel under/along each hose for oil.

If its coming from the front of the engine bay, it is likely the resi, hoses or pump. If from the back, then its either your rack or metal hoses.
You can eliminate the resi and rubber hoses easily by just feeling under them for oil.

I've had a power steering leak problem before, and for me it ended up being the shaft seal of the pump. Oil was dripping from the pump, but not the hose connections. The oil was actually leaking from the shaft, so the actual leak was concealed behind the pulley, making it hard to track down.

[MrWooFarkinHoo]

totally agree with kingo, put a towel, paper etc under front of vehicle first to eliminate the obvious but from experience it will be the block back as above also look for drips on tie rod end shafts amazing what the rubber boots hold in their ridges

[wortus]

Got a big leak but not sure from where....

The first thing I would check is the low pressure hose where it is clamped to the steering rack, from my experience it's the most likely source of a leak. If the clamp is loose tighten it up. I'd then degrease the area and all the other steering parts and check for leaks over the next few days.
If this join is the source of the leak and it is still leaking you need to check the hose for damage at this end and shorten and re-attach if you can or replace it. Best clamps ar ethe ones with a hex head to do them up and the strap is solid not perferated. Do it up with a small socket not a screw driver.