Q&A

have a 2002 mazda tribute. starts up with a charged battery,able to drive throughout the day, but really using any like defrost,heater,etc. had the battery checked, pulled alternator twice,now. went had it tested,then put it back in. went had both tested the altenator and baterry with the car running both tested that they were working just fine. well as day goes on and the battery light comes on.battery is dying, cause for some reson the altentor isn't charging the battery. like ifound out both of them tested good.my voltage readings are ,with the vehicle running the terminal itself was 11.86,the bottom wire was 11.5,the middle wire was 7.60,and thetop wire was .60 now with the car off the terminal read 11.86,the bottom wire read 11.5,the middle 11.3, and the top wire .0 i don't understand in the voltage dropping except possibly the regulator is defective?