my 76 datsun b210 will only crank over when it has a fully charged battery and a jumper box hooked up. Why

1976 DATSUN 210
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RYANPHILLIPS1974
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1976 b210 1400cc engine
Jan 9, 2012 at 10:11 PM
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CARADIODOC
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What are the symptoms when it doesn't crank? Do the head lights get dim or go out? Rapid clicking from the starter relay? Have you measured the battery voltage?
Jan 10, 2012 at 1:56 AM