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Battery drain overnight

Battery drain overnigh, connected a dmm between the ground cable and the battery found a 1100 milliamp drain one the battery. removed all the fuses one at a time on each one it still showed a drain, i could not find which circuit is causing the drain. I checked and rechecked all the lights at night to see if any lights were on could not find any. Please advise

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Can be a relay stuck. Make sure all the P/W will go up and down as they should. A relay can be stuck in the up position. The window switch can also be stuck. Check the Power Seat to see if a relay is stuck or the switch is defective. Move the seat back and forth, up and down, and recline. If a relay is stuck it will move on it's own. Are you sure the radio is not on all the time? Have you checked all the lights? Under hood, trunk, glove box, courtesy, etc?

Posted on Jul 16, 2010


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Battery checked and holds its charge when earth lead and live lead connected the battery will go flat overnight

Something is being left on to drain a battery that quickly, or the system has a dead short in it somewhere. The only drain should come from the alarm system and chronometer in the radio to keep the time correct. That will only drain a battery in about 6 months of not being charged from engine running. I've found the easiest way to check if anything else is still draining power is at the fuse box. With switch off, test each fuse to see if there is still power on them. Then pull the fuse that is still powered and see what isn't working now and the grounded system will show itself. Just leave that fuse out overnight and see does the battery drain down. if not, go thru that system and find the short or faulty unit it's connected to. I always go directly to the grounds to fix problems if something isn't working, yet with your situation, the ground is causing the problem the other way. Something is still connected that shouldn't be.

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04 Tundra battery draining overnight

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 !

Dec 19, 2016 | 2004 Chevrolet TrailBlazer

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Battery drains overnight

Car And Deep Cycle Battery

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What causes my battery to drain overnight? Parasitic (or ignition key off) drain is the cumulative load produced by electrical devices, for example, emissions computers, clocks, security alarms, radio presets, etc., that operate continuously after the engine is stopped and the ignition key has been switched off. Normal parasitic loads are below 75 milliamps (.075 amps). When the parasitic load is greater than 75 milliamps (.075 amps), batteries will drain more quickly. Glove box, trunk, and under hood lights that do not automatically turn off when the door is closed or shorted diodes in alternators are the most common offenders. Cooling fans, power seat belt retractors, radios and dome lights left on, alarm systems, and electric car antennas have also caused batteries to drain overnight. Leaving your headlights on will generally discharge a fully charged car battery, with 90 minutes of Reserve Capacity (36 amp hours), within a couple of hours.

It is highly recommended, especially if you are using a sealed wet "Maintenance Free" (Ca/Ca) battery, that you allow it to thaw if frozen, fully recharge it in a well ventilated area with an external battery charger, remove the surface charge, and load tested both the battery and the charging system for latent damage from the deep discharge. You could have a damaged or bad battery. If the alternator is warm and the engine is cold, then check for a shorted diode in the alternator.

Below are some methods that are used to test the parasitic load with the engine NOT running, under hood light disconnected, all accessories switched off, and the vehicle doors closed:
  • Connect a 12-volt bulb across the positive and negative battery terminals to test the bulb and the battery. If it glows brightly, then remove the negative battery cable and connect the bulb in series between the negative battery cable terminal clamp and the negative battery terminal. If the bulb continues to glow brightly, then start removing fuses or connections to the positive battery post one-at-a-time until the offending electrical component is identified by the bulb dimming.

  • A better approach is to use a DC ammeter, for example a Fluke 175, inserted in series with the negative battery cable terminal clamp and the negative battery terminal or a clamp-on DC ammeter, like a Fluke 336 or i410 around the negative battery cable. Starting with the highest scale, determine the current load. If the load is above 75 milliamps (.075 amps) after the initial surge, then start removing fuses or connections to the positive battery post one-at-a-time until the offending electrical component is identified by the parasitic load dropping to within 75 milliamps (.075 amps).

Oct 17, 2015 | Cars & Trucks

1 Answer

Battery draining overnight,replaced with new battery now starting

Disconnect any one of the cable from battery (either + or - ) and in series with battery connect a 12v bulb of low wattage say 5w or 10w. By connecting in series I mean one wire of bulb goes to disconnected battery cable and the other wire to the terminal of battery from where you disconnected the cable.

Now observe the filament of bulb, if it glows then your battery is draining due to short in your vehicle electrical system. You need to locate this short circuit and fix it, otherwise your new battery would also drain.

Let us know what you found out.

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New battery draining overnight

That is only 10 milliamps-much less than the normal milliamps required for the computer memory, radio presets, clock, and the security theft system. Those normally carry approximately 50 milliamps (0.05 amps). The drain must be elsewhere. Youtube has some videos on locating "parasitic drains". Or if you google it, probably a lot of hits.

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1 Answer

Battery drains while sitting

Hi Anonymous, perform the following tests:
1. Fill acid type batteries to proper levels.
2. Charge battery overnight at 1-2 amps you need 12.5 volts or better after charging.
3. Hook up battery positive cable, then with your multimeter on the milliamp scale connect one lead to the negative battery post and the other lead to the ground cable. Meter should read 3 milliamps or less, 10 milliamps with a radio, 15 milliamps with radio and CB. If your meter reads higher you need to isolate the circuit by pulling fuses and circuit breakers one at a time and observe meter for drop in aprerage then get out your test light and track down the short in that circuit.
3. Make sure all connections are clean and tight especially the negative cable at "BOTH" ends.
4. Hook up volt meter to battery and start engine, if meter falls below 9.5 v while cranking replace battery.
5. With engine running at 3600 RPM battery should read 14.3-14.7 volts if not continue tests.
6. Unplug voltage regulator from alternator at crankcase by front of primary cover.
7. To test voltage regulator go to:
8. With ohm meter, one lead grounded, touch alternator pin meter should read infinity, if not replace stator.
9. With ohm meter, both leads touching alternator pins meter should read 0.1 to 0.2 ohms on 1989 and later models. 0.2 to 0.4 ohms 1988 and earlier models, if not replace stator.
10. With volt meter set on AC scale, both leads touching alternator pins meter should read
16 to 20 volts AC for every 1000 RPM'S 1989 and later and 19 to 26 volts AC for every 1000 RPMS. If not replace rotor.
17. For a free wiring diagram please visit the website below. Good luck and have nice day.
Harley Davidson Wiring Diagrams and Schematics

Btw, I’m available to help over the phone in case u need at

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1 Answer

What causes a battery drain on a 1997 dodge neon

How old is the battery? Is there any aftermarket alarms or stereos installed? And are the cables clean and tight? If the battery is new and the cables are tight you have a parasitic drain. you need a DMM, disconnect negative terminal and place one lead on cable, one on post. Set DMM to amps and compare reading to man. specs usually between 20 to 50 milliamps. If out of spec disconnect one fuse at a time looking for a fall in the reading and that will tell you what circuit has the issue

Sep 05, 2011 | 1997 Dodge Neon

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My 2006 G35 OEM battery recently came to the end of its' life. I replaced the battery with a diehard gold 24F. During the install I checked for the key off current draw by connecting a DMM in series with...

You have to allow up to 30 minutes for the computers to go to "sleep" after the battery is connected and the door is closed. It should be bellow 60ma once all the computers are asleep. A constant 3amp draw will drain the battery probably overnight.

Sep 27, 2010 | 2006 Infiniti G35

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Something drains the battery . I've put in new alternator, still something electrical drains the battery.

to find the draw Switch off all electrical loads such as lights, radio equipment, auxiliary equipment and make sure the vehicle ignition system is turned off. Remove all ground paths from the negative battery terminals. Connect a jumper lead from theground cable to the negative battery terminalYou are now feeding the electrical current requirements of the entire vehicle through the jumper lead. Do not activate any other electrical equipment while the jumper lead is supplying the vehicle current. Wait five minutes to allow all electrical devices to shut down and go to standby mode. While waiting for the vehicle electronics to go to sleep, set up a digital ammeter, such as the Fluke 88to read amps (automatic scale) and make sure the test leads are plugged in to the correct connectors to read amps (COM and A). Connect the COM ammeter lead to the negative battery stud and the positive lead to the connected ground cable After five minutes with the jumper and the ammeter connected in parallel, remove the jumper lead from the three connected cables to the negative battery stud as shown in Figure 3. The vehicles entire current requirements (parasitic load) will now be going through the ammeter. Read the current flow in milliamps. Remember that 1000 milliamps is equal to 1 amp. If the readout has ma after the reading youre measuring milliamps, if the readout has A after the reading youre measuring amps. If at any time during this process the current flow is interrupted (a connector falls off) you must begin again with the jumper connected for five minutes before attempting to remove it leaving the ammeter passing all current and measuring the parasitic load, Under normal conditions, while parked, a vehicle equipped with a standard electronics package should be drawing less than 50 milliamps. If the parasitic load is more than this the vehicles battery storage life will be shortened. If excessive current draw is observed, remove the fuses one at a time until a significant current drop is noted. Do not pull and reinstall the fuses as this may wake up some circuits and cause excessive surge current through the meter. Make note of fuse locations as they are pulled so they can be reinstalled in the proper fuse panel location when testing is complete. When high current draw devices are isolated consider relocating their power feed from a power source that is inactive when the ignition switch is turned to OFF. Sorry So long but hope it helps

Mar 06, 2010 | 1996 Chevrolet Express

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