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9v on the gauge may mean you have a faulty gauge; what is the actual voltage at the battery? With no load and the engine spinning at about 2000rpm, you should see at least 13.5v at the battery. With lights and full electrical load, the voltage at the battery shouldn't drop below 12.5v with the engine at 2000rpm.
You need to measure voltage using something other than the dash gauge. Batteries will not "Pull down" an alternator. If anything, a low battery will cause the voltage from the alternator to be higher than normal (14.5v instead of 13.5v).
Hope that helps! |
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