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Hi, i have a 2000 honda civic si that i resently did a engine swap on. Right now im having problems with my battery. I took the alternator and battery to autozone to get them tested and they tested out that they're still good but when my battery is fully charged and i drive around for about 15-30 mintues my car starts to die on me and the battery starts to die. Im moving to california soon so can any one please help me out if u have a solution to my problem??? thanx

 
Rep Power: 0

From you've said so far it sounds like the alternator is toast.

Has this 15-30 minute battery life happened a couple times? A functioning alternator continuously recharges the battery, in other words it keeps it from dying every thirty minutes.

I had a bad battery that tested fine at Autozone, the tests aren't always accurate.

 
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make sure all of your grounds are connected to check i would start the car with the hood open at night and check for sparks it happened to me and was a simple fix to tighten up a bolt/nut

 
Rep Power: 228

Check whether 7.5A dash fuse 15 is blown.

 
Rep Power: 200

check the connector that goes to ur alternator
then check the battery terminal and trace ur wires
it could be loose somwhere