Henry - Expanding a bit on John T''s comments, 8 volts is indeed too high - 7.0 to 7.3 is the max a 6 volt battery should be seeing.
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Inside the regulator, voltage is controlled by the voltage/current regulator relay - the relay with the normally closed contacts (ie. the one with its contacts held SHUT by spring pressure).
Voltage is adjusted changing spring tension on this relay. And spring tension is adjusted by bending the fixed hanger on the regulator relay: higher spring tension = higher voltage.
In your case you need to bend the spring hanger to reduce the spring tension. But proceed VERY carefully - only takes a slight change in spring tension to significantly change the voltage!
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