300D - Alt problems again!!!

Hello all

A few weeks ago the charge, disk pads and hand brake lights on my 1982 300D started staying on after the engine had started after I'd spolled some collant on the alternator and belts. I washed the alternator and belts (at this boards suggestion) and that seemed to cure the problem.

Yesterday, the lights started to stay on again. I'd bought new belts, so I changed them (2 alts and power steering) yesterday night, but the lights are still staying on. I'm afraid that this time it might be more serious.

How do I determine if the problem is the alternator itself or the alternator voltage regulator? My interest in the latter is one of cost.

Any and all help will be very appreciated.

Nicolas

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1982 300D - http://members.xoom.com/nicodore/