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240z battery drain

Battery drains over night. no lights on. relay clicking on passenger floor board even with key out but not consistently. fuse for turn signals is already out. if i drive it every day it starts every time and the alternator will charge up the fully drained battery.

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Have you confirmed by going out to the car at night that none of the interior lights or lighted visor lights truck or hood lights are staying on? That is by far the most common cause of a battery drain. Other less common cause is a defective alternator rectifier diode Disconnect the battery overnight as well to confirm you don't have a shorted battery cell, that to will run the battery down, it is called an internal drain. Also make sure the top of the battery is clean of any acid.

Posted on Feb 09, 2012

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What causes intermittent starting?


sounds like a parasitic load on your battery. it will drain voltage from your battery continuously at a slow rate so while car is sitting over night it is drained but when you get it started in day the alternator is able to maintain battery voltage. could be something as simple as a visor light not turning off when closed or glove box light not turning off when closed or alarm system drawing excessive power.

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My 2002 Toyota Tundra 4.7(V8) has an intermittent start and the battery drains overnight from 12.5V to around 10.0V. I've tested for parasitic draw and every time I test my reading is ~ .025A...


I think I would attack the drain problem first. Something has to be draining the battery, it does not have to be a steady drain. It could be something serious for 30 min in the middle of the night. You may need to pull fuses one at a time to try to narrow down the circuit. it could even be a weak component in the alternator or computer. I know you said you replaced the alternator.
If it goes down overnight, it should also go down during the day. Can you leave the meter connected and check it every hour or so ? ?
Another component that could be suspect is the key switch. I know you said you checked it, but it could be a part-time problem.
When the starter or relay clicks, I would want to know how much voltage I have at the starter post, and coming out of the key switch. Then how much at each point in between. You also have a neutral safety switch in that circuit.

Jun 02, 2013 | Cars & Trucks

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Why does my 96 Cadillac Eldorado battery keep discharging?


First step have the battery tested, a bad cell can cause a internal drain and kill the battery, if the batt is ok then check for interior lights like visors that stay on or interior light that come on by themselves at night due to defective door switches.

Dec 27, 2012 | Cars & Trucks

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Nissan 2002 Pathfinder is draining its battery


If it's clicking, it's not a fuse , its a Relay. Relays Do sometimes stick. Or it can be clicking due to low voltage that was caused by something else.

To see if that's your issue, charge the battery, take the Relay out of the car and see if the battery stays charged after 12 hours.
If teh battery stays.. then first step is to replace the relay.

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My 98 lumina has a constant power draw from somewhere. I just replace the battery and had the alt tested (it was good). I have to jump the dang thing every morning but if I drive it enough during the day...


The alternator may charge fine but could drain the battery through a bad diode,have you checked the alt for a bad diode?Disconnect the battery positive cable.Put a regular 12v test light between the battery positive post and the positive battery cable.If the test light is bright you do have a drain,if dim it is OK.A dim light may mean the drain is internal in the battery.If you do have a bright light remove a fuse ,one at a time from the fuse box until the light goes dim.Once dim you have identified the bad circuit.If removing all fuses do not dim the light,disconnect the alt charging wire at the alt,if that dims the light,then you do have a bad diode.DO NOT create a drain(bright light) when checking for the drain by turning on the key or opening a door/trunk etc.
Also,do an overnight battery check by disconnecting the battery overnight,if things are fine the next morning after the battery was disconnected then it is a drain in the vehicle,if the battery is dead even after being disconnected overnight,,then the battery is bad.

Jun 15, 2017 | Cars & Trucks

1 Answer

This is an additional inquiry regarding my Taurus. My 1998 Ford Taurus has a battery that keeps dying in about 1-2 days. The battery is new, and I was having the same problem with the old battery as well....


The best way to check for a power drain or a "draw" on the battery is to dis-connect the negative, or "Neg" (-) side battery cable and then connect a test light not a meter, between the "Neg" (-) side battery post and the battery terminal at the end of the battery cable.

With the key removed, all of the doors closed, and no accessories turned on, and also if there is a light under the hood dis-connect it for now. Normally the test light when connected should start off bright and then quickly dim down until the test light is almost not even showing a connection and the filament inside of bulb that is inside of the test light will barely glow and not even light up, this is normal and the only thing that should be drawing power is the KAM (Keep Alive Memory) for any control moudules or accessories that require a KAM. If this is the case then the condition of the battery would be suspected of being at fault and an internal short inside of the battery will not show up as a draw on the battery, and the battery voltage will slowly drop off all by itself with nothing even connected to the battery.

If the test light does not dim down and stays bright, or it will dim down but will also still dully light up the test light, then there is a draw on the battery and if you start removing the fuses until the test light dims down and barely makes the test light filament glow, then you will know what circuit is at fault, but if the light never dims down with all of the fuses removed, the doors are all closed, and no accessories are turned on, then dis-connect the wiring to the alternator and if the test light dims down to almost nothing, then the draw is in the alternator itself.

Common places to find a draw are the vanity lights inside of the sun visors are not turning off or are shorted, the power door lock(s) are faulty, or after-market accessories that are not properly installed, and there is even the possibility that something metal has dropped down into a cigarette lighter or a power point and is making a connection there, such as a watch battery. Also check the wiring for any wires that have been melted together or if they are missing insulation allowing the wires to touch each other or a body ground.

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1 Answer

Should most of my fuses light up a test light when i test them with a test light,with the key off?I have a battery drain when it sits over night.I did the test with the test light hooking it to the...


Front seating area, passenger side, under dash, mounted on support bracket under glove compartment not all fuses will light tester unless the its on

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2005 Dodge Caravan with Dead Battery. Replaced and new battery died. Took it in for service. Alternator checked out ok and Drain was within tolerance. Will still die if I let it sit for more than a...


Disconnect battery from vehicle overnight to check for internal battery drain.......just take one of the cables off.
If the battery is still up and starting the vehicle after being disconnected after a day or two......the drain IS in the vehicle and will have to be checked again.
Do it yourself.
Buy a cheap 12 volt test light.
Place it between the cable you removed before.
One end on the battery post and the other on the cable end.
Now....with the key off......
If the light glows brightly....you have TOO MUCH drain.
We want a dim glowing light.
The dim light is just the memory circuits in the electronics and OK.

With the doors closed....take out one fuse at a time until the light glows dim.......the fuse that dims the light is the problem circuit.
If no fuse dims the light...remove relays one at a time.
Remember....some fuses and relays could be in the engine compartment and under the dash.
If no relay dims the light disconnect ALL alternator wires.
Remember....anything that uses power will make the light glow ....keep those doors closed (we do not want interior light drain affecting the test ) and if you have a under hood light check it first by removing the bulb.
We do not want false readings.

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2 Answers

Battery has been drained


the clicking you hear is a relay trying to make a connection. this is due to the fact that it doesn't have enough voltage to keep the contacts closed or there is a short in that system and something is making it want to close the circuit but doesn't have enough voltage. the only way i would know which relay it is is to have you look for it in the junction box or the fuse block under the dash. I then be able to provide a resonable solution for this.. please post back with the result of the serch.

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