Question about 2004 Chevrolet TrailBlazer

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04 Tundra battery draining overnight

04 Tundra V8. Battery is draining overnight, not every night, just sporadically. New battery, new alternator. Multi meter test shows DCC fuse & ECU-B fuses as the only ones pulling current. Any ideas?

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  • Chevrolet Master
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Did you let the vehicle sit for 30 min. before testing ? Modules need to time out (go to sleep - power down etc.. How are you testing ? Have a ammeter inline with battery negative cable and negative battery post . Have any doors open ( door switch closed ) Key out of ignition ? How much current ? 50 milliamps max !

Posted on Dec 19, 2016

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Posted on Jan 02, 2017

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What possible way can check to tell if my overnight battery drain is due to the diode sticking? Is there a test or a tip you could offer? The battery is new and the alternator tested ok.


A diode doesn't "stick". Either one of your circuits is using battery overnight, the battery is defective, or it's not charging.

Assuming the battery is "good", pull all of the fuses overnight. If it's good in the morning, put all the fuses back in, and next night leave one in. Next night, the next fuse, etc.

Once you know which circuit is draining your battery, you can troubleshoot further.

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Apr 13, 2015 | Cars & Trucks

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If a good battery is losing charge overnight then it is probably being drained by something left on! The usual areas to look at would be the boot light or glovebox light, check these or anything that might be staying on when the ignition is turned off!

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1 Answer

Battery keeps going dead overnight. I've already changed the alternator which tested to be bad and still having the same problem


if you installed a new battery as well as a new alternator, it should not go dead overnight. if you have a short in the vehicle that will drain a new battery that rapidly, the cable would have been melted already. although, dome lights do have a tendency to drain batteries, but not overnight. use a multimeter to check the battery voltage while the motor is running. it should read above 13 volts DC signifying that the alternator is indeed charging the battery.

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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.

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Battery runs down overnight the battery is new


It is likley that there is a draw on the system draining the battery while it sits, could be a bad alternator. Try disconnecting the battery when you park the car for the night, re-connect it in the morning and see if it's ok. Then get the electrical system checked to confirn either alternator or system draw.

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Look at ths page I put up will give you a clue. If you want to get it done right sometimes you got to do it yourself.
http://www.fixya.com/cars/r3955386-check_battery_altanator_most_cars

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Anyone have a picture of the alternator on an '03 Tundra V8? Trying to check output - losing battery V overnight.


Start the engine and check the voltage at the battery with a volt meter. It should read from 13.5 to 16 volts. If it reads out of this range the alternator is defective. If the output of the alternator is ok, then you have something that is on and is drawing power overnight. Dome light, under hood light, glove box, brake light, etc. It can also be a relay that is stuck as in a P/W relay.

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Check and make sure the Air Condition cluch is disengageing, I had the same problem afew years back.

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