The heatsinks are connected (more or less) to the back part of regulators. Generally that (metallic) back part is either standalone - therefore needs to be connected to ground - or connected to the middle pin (all regulators have 3 pins).
You should consult databooks to find out your regulator references. The databook will tell you how is connected the back part.
I think most seminconductor companies have their databooks online, if you dont have access to any. If you're stuck with your references post the brand name and the exact reference here, maybe someone (including me) will be able to answer...
[ 09-28-2001: Message edited by: SureFoot ]
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