Some thing is draining all my battery while i'm driving, its dead if i turn off. alternator is good, batteries are good. what now???

A failed/ worn out battery or a current
drain you have to find

Could be the alternator
Could be many things

Do a battery drain test to find the problem. See post below
Battery dead in the morning Ricks Free Auto Repair Advice

Someone will need to check the fuses and fuseable links (if equipped) to see what is dead and why. Could be a fuse or a bad connection at the battery or fuse box.

Hello,

Based on your problem, that I read fully twice, based on ALL THE things that are dead, this is positively a battery charging system problem.

Meaning this, Sense nothing works including head lights, which would work most likely, and they don't you are going to find this problem in a couple possible places. It appears your battery is dead. Now, listen if your battery is not dead or is good, the cables (positive or negative could be loose, or bad connection. What could also of happened, to cause this is a couple of things. If you have a bad alternator as you were driving it, it would not be charging your battery and actually draining it, with all your electronics on while driving. So, when you parked it, that battery most likely is completely dead or a positive of ground from that battery if loose or poor connection, allow the alternator not to charge battery while driving.

In conclution. Check good the battery, and connections and then the alternator. Now, sense you have no testing equipment as you stated, hard to test the alternator, all you can do, is somehow charge your battery and get car going and try and drive to closest battery place, even auto zone can check your battery cells and your alternator. I hope this helps. Mike

HAVE BATTERY RECHARGED OR VECHICLE JUMP START.WITH VECHICLE RUNNING MAKE SURE ALTERNATOR IS CHARGING THE BATTERY.ALTERNATOR OUT PUT AT BATTERY SHOULD BE 13.5 - 14.5 VOLTS.IF NOT CHECK ALTERNATOR FUSE.CHECK ALTERNATOR + BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES MAKE SURE NONE OF WIRES LOOSE BROKEN OR DISCONNECTED.IF ALL IS GOOD AND ALTERNATOR OUT PUT LOW ALTERNATOR FAULTY.IF ALTERNATOR VOLTAGE OUT PUT OKAY. YOUR BATTERY DRAIN PROBLEM COULD BE FAULTY AC HEATER BLOWER MOTOR RELAY.CHECK INSIDE CAR WITH THE IGNITION SWITCH OFF.MAKE SURE RADIO TURN OFF.INTERIOR LIGHTS TURN OFF.HEAD LIGHTS TURN OFF.LISTEN FOR ANY NOISES LIKE BLOWER MOTOR RUNNING, OR FAULTY DOOR LOCK SOLENOID CLICKING NOISE.IF EVERY THING SO FAR OKAY.OTHER POSSIBLE CAUSES BATTERY DRAINING COULD BE FAULTY ALTERNATOR,FAULTY STARTER SOLENOID CONTACTS SHORTING OUT.THE PCM COULD DRAIN BATTERY IF FAULTY.THE NEW BATTERY COULD BE DEFECTIVE.

You need to make sure that your getting good conection to your battery. If your alternator is fine, as you stated, you might not be getting a good conection. Your alternator may be keeping your battery alive just enough when your driving. Check all connections. Hope this helps.

Does the battery charge even after it drains. Even though it's a new alternator, it could still be bad. The battery could even have a dead cell because it's draining while you're driving. Sounds mainly like the alternator output isn't enough. Internal voltage regulator inside the alternator is usually a big problem, it can't be replaced, except by a new alternator or have yous rebuilt.

somewhere in the system, you have a power drain, or a bad battery, try unhooking the battery overnight, and see if it is dead the next day.

you need a mech you have a draw whitch meeans something is on at all times or internal short on something or pass bad batt.
make sure things ore off like dome light trunk light cig lighter out of socket cell phone charger etc. good luck

In my case, the instrument cluster was bad, causing the MFI display and radio to go haywire and putting a contstant drain on the battery. $760 to have the VW shop replace it. No problems related to the battery or alternator have occurred since.

Good luck.

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