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how would i know if my battery's are bad


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Voltage is not everything with a battery. Even if it is showing 12+ volts, it doesn't necessarily mean it is good.

Amperage and Voltage are different. Like EclipseChris said, do a load test.

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And just because a battery is resting at 12.0 volts doesn't mean it is bad either. My truck if it sets for a week or longer, my d3100's will rest at 12.2 but just crank the truck up and let it idle for 30 minutes or so and good for another week.

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would do any good if i go to auto zone and have it checked

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well also when first got the car a couple days later my car would not start so i replaced the battery. then couple day's later i installed the batcap 2000 well couple days i had a fender bender so later my check engine light came on so i went volkswagon dealership they told me i had low voltage. so i went to a autopart store they told my battery's good i have a bad alt and my alt putting out 13 volts. so my car still running so i went to alt shop they could not tell me nothing except they would have to take the alt out and it's gonna take 3 hours to get it out. so i went to another place they said my alt and battery fine.

people who have bought from me Team Bassick (ALPINE) Purplehaze nidus

head unit sony dsx-s310btx
subs 2 12 incriminator audio king of bass
subs amp incriminator audio 20.1
mids/highs
mids/highs amp incriminator audio 6.4
equalizer clarion
crossover interfire
alternator 1 mechman 240amp
battery's xs power 1 d2100 2 d3100
sky high car audio 1/0 awg ofc wires

memphis car audio 1/0 ofc
xs power xs flex 4 awg

sky high car audio 8 gauge ofc

sky high car audio 12 gauge ofc

t spec rca


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well i stop by a audio shop they said that the problem is there no battery isolator installed my wiring in my trunk needs to be cleaned up when i take my battery's off the charger that they keep dropping because the way it's wired that they try to keep the same charge and i need to upgrade some of parts that hook to my battery under my hood

people who have bought from me Team Bassick (ALPINE) Purplehaze nidus

head unit sony dsx-s310btx
subs 2 12 incriminator audio king of bass
subs amp incriminator audio 20.1
mids/highs
mids/highs amp incriminator audio 6.4
equalizer clarion
crossover interfire
alternator 1 mechman 240amp
battery's xs power 1 d2100 2 d3100
sky high car audio 1/0 awg ofc wires

memphis car audio 1/0 ofc
xs power xs flex 4 awg

sky high car audio 8 gauge ofc

sky high car audio 12 gauge ofc

t spec rca


check out my building log http://www.stevemead...frey-build-log/

http://www.stevemead...d-other-things/

check out audio gear i have for sale
http://www.stevemead...51#entry1595151

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they said i also need to upgrade my alt since mine stock and i did not really wanna do that alt for my car are expensive since it'a a volkswagon

people who have bought from me Team Bassick (ALPINE) Purplehaze nidus

head unit sony dsx-s310btx
subs 2 12 incriminator audio king of bass
subs amp incriminator audio 20.1
mids/highs
mids/highs amp incriminator audio 6.4
equalizer clarion
crossover interfire
alternator 1 mechman 240amp
battery's xs power 1 d2100 2 d3100
sky high car audio 1/0 awg ofc wires

memphis car audio 1/0 ofc
xs power xs flex 4 awg

sky high car audio 8 gauge ofc

sky high car audio 12 gauge ofc

t spec rca


check out my building log http://www.stevemead...frey-build-log/

http://www.stevemead...d-other-things/

check out audio gear i have for sale
http://www.stevemead...51#entry1595151

Mechman_300x100px-2.jpg

3d7304fe.jpg

header3-1.gif

SkyHighCarAudio_zps27302c94.png

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