10-16-2006, 12:00 PM
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CC Member
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Join Date: May 2001
Location: California,
Ca
Cobra Make, Engine: NAF 289 Slabside Early Comp Car with 289 Webers and all the goodies. Cancelling the efforts of several Priuses
Posts: 6,592
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Are you using a separate voltage regulator? If so, the light is controlled by the action within the remote mounted regulator. One side of the bulb gets power from a switched 12 volt source (or direct from key switch) and the other side is grounded by the regulator after passing through the fuse panel or being connected directly to the regulator. When enough current is created by the excited alternator, the circuit grounding the bulb is switched eliminating the ground and causing the illuminated bulb to go out. On the old voltage regulators, this was done with a set of mechanical points and electromagnetic energy, on the new regulators, transistors do the switching.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
Last edited by Rick Parker; 10-16-2006 at 12:24 PM..
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