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					Originally Posted by Euan McDonald  , not sure if its a vibrating reg? | 
	
 They might be refering to the vibrating points in the voltage reg. circuit ? I think these devices also have vibrating points as current limiters ? The other of the three  contact is the battery isolator. Mike 
BTW you can salvage Ni chrome wire from old domestic electric heater elements , and custom design your own resistors to suit your needs . The former needs to be ceramic or some other heat tolerant material.