How do I check Alternator output?

[.Mark]

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On my Serpentine Chimaera?
Wife went to take it to work today and noticed the heater blower wasn't working. When I went to have a look I noticed the battery light in the dash was on too.
I'm not sure if they are related and time was pressing on so she used one of the other cars but I need to take a look at it.
The 'fan belt' was slipping a bit too which could account to the light being on but I'd like to check what the alternator is kicking out.

Can anyone tell me where to stick the multi-meter in simple to understand instructions, better still, any photo's? I know M@ was under there with a camera a little while ago.