View Single Post
Old 02-07-2010, 06:33 PM   #3
ChrisZang
Registered User
 
ChrisZang's Avatar
 
Join Date: Mar 2006
Location: San Carlos, CA 94070
Posts: 1,450
let's start with the obvious: You could have a dead battery, go to a good car parts store, they can check if the battery still holds a charge

If you pass this test, then my next question is if you recently added any new "stuff" (Amp, Navi, etc)

And last not least, buy an amp meter, disconnect the + cable from the battery (but only if you know your radio code) and measure how many amps are flowing when the ignition is off, by inserting the amp meter between the + pole of the battery and the cable you just pulled off.

A little theory: if you have a 50 amps / hour battery, that means that your battery can supply 50 amps for one hour - or one amp for 50 hours. So in your case if the car was standing for 14 days = 24 * 14 = 336 hours , a current as low as maybe 0.1 ~ 0.2 amps can drain your battery. I'd guess that you need at least half of the juice left in the battery to crank the car.

So look how many amps are drawn and if you find a reading above let's say 0.1 amp, start pulling fuses from the fusebox until the amps drop.
Then you found your culprit
__________________
I still wave at Boxsters, but they no longer wave back :-(
2002 Boxster S "Violet" (sold but not forgotten)
2009 Carrera 4S "Kelsey" (current ride)
2015 FIAT 500e "Nikki" my commuter car
ChrisZang is offline   Reply With Quote