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Re: 1997 Avalon's Battery dies if not driven everyday.
Two most likely sources are the battery and alternator. How old is the battery? Too old and it won't hold much of a charge. Is the alternator producing a good charging voltage of ~14V? Much below that and it can't keep up with the car's needs. Both are fairly easy to remove and bring to a parts store for them to run a load test.
Barring that, you may have an accessory that is drawing too much current when the engine is off. Shut off the engine, remove the negative battery cable and hook up a multi-meter in series and set it to read mA. Anything over ~50 mA is too much draw. To pin the circuit down, pull each fuse to see where the current is going through...when the current drops off, you found it. Good luck!
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Current Garage:
2009 Honda CR-V EX
2006 Mazda 3i
2004 Chevrolet Silverado 2500HD
2003 GMC Envoy XL
2000 Honda ST1100
2000 Pontiac Sunfire
Vehicle History:
2003 Pontiac Vibe AWD - 1999 Acura Integra GS - 2004 4.7L Dakota Quad Cab 4x4 - 1996 GMC Jimmy 4wd - 1995 Chevrolet C2500 - 1992 Toyota Camry LE 2.2L - 1992 Chevrolet S10 Ext. Cab 4.3L - 1995 Honda ST1100 - 1980 Yamaha XS400 - 1980 Mercury Bobcat.
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