William_H
regular
Reged: 28/07/2003
Posts: 3520
Loc: West Australia
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I tend to agree with Vic as in many simple systems the current for the light actually goes through the brushes. However for the cost of replacement brushes (with regulator) it may be worth doing just to see. This is assuming your alternator has a popular car type origin.
if it is as I am familiar the regulator is a little black plastic block about 20mm across on the back of the alternator (opposite end to the pulley) with 2 screws holding it in. It has wire push on connections or a plug. When you remove it you will also remove the brushes and be able to see the slip rings. (hopefully) the rings should be clean and bright not too burnt.
It is worth having a check olewill
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DuncanMack
regular
Reged: 02/10/2005
Posts: 1646
Loc: Dunno, no GPS signal...
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Quick test for worn brushes....
Whack alternator with a hammer - not hard enough to damage it tho 
This usually helps the springs to shove the brushes out the last little bit.
If this gives a (temporary) fix then replace brushes.
Car and truck tip!
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Duncan
The march of progress - but in which direction?
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searover
regular
Reged: 03/02/2004
Posts: 218
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Thanks to you all ,I knew you wouldnt let me down, the experience on here is unbielevable. Ive taken the altenater off now and will have it serviced, or repaired, ill let you know the outcome.Thanks again chaps... 
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