OK Luke,
Try the starter with the dome light on - I usually just leave the door open. Watch the light, if it goes to way dim while key is in start position, even though the starter only clicks, the starter is drawing more current than is available.
The usual problem is a low battery. That comes from old age and/or worn out brushes. Check the brushes by removing the regulator/brush unit from the back of the alternator. It's not necessary to remove the alternator or any if the connections, unless you have a turbo. (Remember to unhook the negative battery terminal first.) If the brushes are less than 3mm long, replace them.
Before trying to install the regulator/brush unit, have a look into the hole they come out of using a mirror and flashlight. You'll see the slip rings - what the brushes ride on. When you put the unit in, it's possible to put it in where the brushes are not on the slip rings - disaster.
If all that is OK, the look at Paul's post and start checking the connections. My suggestions are based on likely failure points sequenced by what's easiest to check and what's cheapest to fix.
Good Luck
Bob
:>)
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