Question about Volkswagen Jetta

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1998 jetta battery drains over night. pulled neg battery cable and pulling 10 volts pulled all fuses and still same but pulled main wire to fuse box off pos.battery and 10 volt drain goes away???

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Unhooke your altinator it has 6 diodes in it if one is bad it will drain the battery and still charge,unhook it and recheck I bet that is your problem,Thanks and I hope this helps

Posted on Oct 01, 2009


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2002 chevy tahoe, draw on battery, new battery, altenator good, discounected pass-power seat(heard they go bad)...don't know what to do?

try unhooking the power wire off the back of altenator it may charge but if a diode is stuck it will drain your battery if this is the problem the altenator will still charge but will drain your battery over night

Jan 17, 2011 | Chevrolet Tahoe Cars & Trucks


Voltage draw down found!
1) repaced bad battery
2) rechecked voltage draw...

Voltage draw down found!
1) repaced bad battery
2) rechecked voltage draw still showing 12 volt drain with all under hood fuses, relays, and interior fuses and relays pulled.
3) Computer was the 12 Volt drain, & had to reprogram itself.
4) gave the new battery a good long charge, reinstalled the battery into the vehicle.
5) Hooked the battery up, pulled the keys out of the ignition, close and lock all doors with auto door lock. Waited minimum of 20 min so the computer would go back into the sleep mode.
6) after 20 minute wait, rechecked the voltage draw by removing the neg battery cable from the battery, hooking volt meter + lead to battery cable end, and neg lead to battery neg post, nothing showing or zero reading.
7) Hooked the neg cable up to battery, started the truck and let the engine idle to normal run temp, then fast idled 1200-1300 rpms for 2 minutes, then drove the vehicle for 5+ miles and alternating speeds. All appears back to normal now. Alt showing 14.2 to 14.4 volts, and no other problems.
After all of the afore mentioned, my problems began with a bad battery cell, thus caused my computer to have the memory reset.Until the computer was reset, I had a 12v continious draw down! I got this info from a repair manual, that I purchase sometime ago. Thanks for your alls help........EJB

on Dec 30, 2011 | 1996 GMC Yukon

1 Answer

Lam having a slow draw coming from my trunk ligth l thougth i had it fixed by taking the blub out but i think i still have a draw coming from some were? how do you check fro a draw again?

take loose the negative battery cable and attach a 12 volt test lamp to the neg batt term to the neg batt cable. connect a jumper wire at the same time at same location and leave it with ALL CAR ACCESORIES OFF! AND SWITCH OFF. after a couple minutes take jumper wire off while leaving test lamp connectedthe whole time if the test lamp glows you have a parasitic drain. proceed to pull fuses one at a time untill the lamp goes out. note put each fuse back in if the lamp doe not go out for that may have to pull the hood lamp and the fuse for the dome lamps as all accesories must be off to do this and if you open the hood or door then those lamps must be taken out of the fuse power option. if the test lamp does not go out then you have to get deeper and start disconnecting wiring connectors untill it does. then you at least will know what circuit is causing the problem or wire on a diagram.......

Jan 11, 2011 | 1998 Plymouth Breeze

2 Answers

I was having problems getting my 1997 jetta to start in the mornings, after getting it jumped, it would be okay. I replaced the battery and was having no problems. On Christmas Day, I didn't start it at...


Dec 28, 2010 | 1997 Volkswagen Jetta

1 Answer

1998 vw jetta has 10.3 volt draw when you take the neg. cable off battery. pulled all fuses and still have draw so i pulled wires out of pos. side of battery one at a time and found that the main power...

Unhooke your altinator it has 6 diodes in it if one is bad it will drain the battery and still charge,unhook it and recheck I bet that is your problem,Thanks and I hope this helps

Oct 01, 2009 | 1998 Volkswagen Jetta

1 Answer

1998 Corvette drains the battery in less than 2 days.

No, corrosion will not cause a battery to drain, even if the corrosion is on the terminals. Several factors can cause battery drain, I would first have the battery tested to see if the battery it self is not bad. If the battery is good, then the most common is a short. All most all new cars have a certain amount of drain,(measured in milivolts) this drain is for clocks and computer memory's, and it would take several days of a vehicle sitting for the battery to be drained. Don't immediately assume you have a problem if you see 2-6 milivolts of drain on a battery with the key out, now if your battery is being drained after being parked over night, you have a problem. The easiest way to pin down the problem short is to disconnect your positive battery cable from the battery, take a 12 volt test light and clamp one end to the positive cable, and hold the probe to the positive post. Now if you have a short the light will come on. Have someone help you by pulling the fuses one at a time. If when a fuse is pulled the light goes out you have isolated the short to that system. If you pulled all the fuses and the light never went out try disconnecting all the wires from the alternator, 9 times outta 10 do this will let you know where your short is. If the system is not critical like power locks some people just leave the fuse out. 

Mar 05, 2009 | 1998 Chevrolet Corvette

1 Answer

Battery being drained

The key will not come out if not in park. Put a volt meter on the neg post below neg cable put the other wire in the cable. keep that connection do not loose it. watch the milliamps pull fuses untill draw drops out. Now you know what circuit is the fault you can put the fuse in and repeate steps with all the items in this circuit. You will find the draw. Keep many fresh cans of patience while doing this.

Mar 01, 2009 | 1981 Ford F 100

1 Answer

My battery drains if the car sits for more than 24 hours without running.

Somewhere, you have a subsystem in the car with a short that is causing your battery to drain. The way to narrow this down is this:

Get a 12-volt light bulb (any bulb from a turn signal or something to that effect will work), and solder a wire onto each lug on the bottom. Disconnect the cable from the negative terminal of your battery, and place the bulb inline with it, so that it is "cable - bulb - battery" (connect one bulb wire to the neg battery cable, and the other to the neg battery terminal). The bulb should light up. This is because you have current being drawn through the car.

Now, go to the fusebox, and take out the fuses for the radio, the car's computer, and the clock (since these all have current drawn at all times). Now of the remaining fuses, remove one fuse at a time. Check the bulb each time - if it stays on, the fuse you have just pulled is not in the circuit with the drain. Put the fuse back and move to the next one. If you pull a fuse, and the bulb goes out, you've just broken the conduction circuit - you've found the system in the car that is responsible for the current draw, and have stopped it by pulling the fuse and opening the circuit. Whichever system or systems that fuse is intended to safeguard, that is where you must now troubleshoot.

I know it's only a partial solution, but it'll get you into the neighborhood of where the problem is, and once you get there, post up some more info and maybe we can take it further and figure out the problem.

Jul 25, 2008 | Mazda MX-5 Miata Cars & Trucks

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