Question about 2008 Subaru Outback

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Electrical battery drain OR "parasitic drain"

I replaced the dead battery. Both AAA tech and auto shop manager measured a "parasitic drain" of 1.85 Amps draining the battery, including the brand new battery. What's causing the drain?

Posted by Anonymous on

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Seen this "mystery drain" many times. Check spark at the battery to see how big the drain is. For this simple test, blow away any (explosive) battery charging fumes. Leave one terminal on and gently touch the other to its post in fairly dark surroundings. Then try it again with the wires taken off the alternator. Your spark is now probably much less. Usually bad diodes leaking electricity backwards through the alternator cause this drain. Replace the alternator or the diode pack inside it. Some mechanics recommend actually measuring the drain.... hahaha. OK whatever.

Posted on Oct 07, 2016

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Replaced starter in 99 Saturn. Battery went dead, got new one ...same thing. REPLACED ALT. SAME THING. Had alt tested, it was good. Wont hold a charge, wont start. Could starter wires be crossed?


Instead of guessing (could wires be crossed ) Testing the electrical circuits is the way to find the problem . Battery goes dead when ? over night ,while driving the vehicle ? If it goes dead overnight you have a parasitic drain on the electrical system . Look at a wiring diagram an check the wires for correct hook up . Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. Year , make , model an engine size . under system click engine then under subsystem click starting . Click the search button ,then the blue link . Really don't think you could cross the wire's ,only two size wires (connectors ) . only hooks up one way.

The BEST Way TO Perform Parasitic Draw Test

How to voltage drop test starter motor circuit
If you can't find the problem after viewing these videos your best bet , take it to a qualified repair shop.

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My new battery goes dead overnight on my 99 ford van?


You have a parasitic drain on the electrical system . here you go watch eric the car guy walk you through the diagnostic steps in finding this drain . How to Test and Find Parasitic Battery Drain Key Off

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My car wont start the acc lights and radio work but it wont turn over occasionally it ticks when i try to turn it over


check fuses and relays --try boosting the car battery may be able to turn on lights but not able to start vehicle their is a tsb technician ser vice bulletin on the 07 for power drain from the onstar module if starts have battery and alternator tested most auto stores offer this service for free -no start check key and ignition switch for wear worn key or switch will turn but not start vehicle and also check starter but the occasional click points toward a dead battery COMMUNICATION PROVIDES INFORMATION TO HELP THE DEALERSHIP TECHNICIANS PERFORM A PARASITIC DRAIN TEST FOR THE ONSTAR MODULE. WHEN PERFORMING BATTERY PARASITIC DRAIN TEST,
Want to learn how to fix NHTSA #10078735?f
http://www.pontiacproblems.com/tsbs/G6/2007

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Fixya guys give wrong info like Auto mechanics.Most of the time theirs nothing wrong with your car. Like if Battery dead. Just recharge it ! You don't need new battery like Stu*** fixya guys say!!


Sorry but batteries don't just go dead for no reason ! A parasitic draw on the electrical system ,do you know what that is ? Do you know what control modules are ? PCM/ECM , BCM , EBCM , SRS , HVAC etc .. After key is switched off these modules power down (go SLEEP) , sometimes they don't . This causes an electrical drain on the system causing a dead battery . I will admit some guys on here do jump the gun a bit . Never I repeat NEVER replace anything on a vehicle without testing . Load test the battery first .

Mar 16, 2016 | Cars & Trucks

2 Answers

What keeps draining my battery?


this is called a parasitic drain. It could be a trunk or glovebox light that isnt turning off.

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1 Answer

I have a 2000jeep Cherokee limited. When I crank


which engine, we can not guess engines here. not ever. (rare)
this is called a XJ car.
2.5l or 4.0 liter or the Diesel????

ok electrics 101.
all electronics and electrics have a rule
of power is low, things go nuts.
its like not eating and blood sugur drops then you drop.
same deal;
each part has a rule for this but im not going there, (can but wont)
the starter goes dead at 8v
if the battery is weak many electronics goes nuts at below 10v.
varies by year and make of car and all options on the car.
for windows, IM NOT GOING THERE> way too complex of topic that.
(mix of parts)
so when the door goes nuts, what is the battery voltage
a tech, uses a voltmeter,
walmart sells one for $10 in auto and in the elect. department.

is the battery too low, cranking?
here are the 3 rules for the battery after cleaning posts.

1: charged battery rested , is 12.6v. not in siberia , summer temps.
2: running engine battery voltage is 13.3 to 15v, if not the battery drains.

3: cranking, most books show 11v. but if not below 10v your ok
most the time. but who knows, that? nobody on earth.

why not use booster jumper cables to a running other car AAA STYLE?
if the noise goes away, then may be ,
the battery is low
battery discharge
or battery is weak (bad)
or you have parasitic drains.
or the charge system is bad.

KEEP IN MIND i cant hear it. so... all my answers will sux.

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1 Answer

Something is draining my battery - tried new battery and checked the alternater. What else could it be ?


you have a parasitic drain. if your not a auto tech dont look for it your self go to a shop. somethis is shorted to ground.

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3 Answers

My sister has a Pontiac Sunfire. I believe the year is 2005. Well she's having problems that every morning a car needs a to boost her vehicle. The battery and alternator have been replaced. We can't seem...


What you are describing is called a "Parasitic Drain"

In automotive terms, a parasitic drain is an electrical load that draws current from the battery when the ignition is turned off. Some devices, such as the PCM and the radio memory are intended to draw a very small amount continuously. These draws are measured in milliamps (mA).

An abnormal parasitic drain could be something like a glovebox lamp, lighted sunshade mirror, aftermarket accessory, or luggage compartment light that remains on but undetected. Or an electronic component may malfunction and cause a parasitic drain that is larger than normal specification.

The recommendation for maximum parasitic drain is around 30 mA (0.030 amp). A typical drain today actually falls into the 7-12 mA range, even though some vehicles do approach the maximum.

Unfortunately, many mechanics do not know how to properly test for and/or track down a parasitic drain. You need to find a shop that has a technician that is familiar with this type of problem. The best way is to ask them specificly if they know how to diagnose a parasitic drain. If they hesitate, or act like they don't know what you are talking about, move on to the next shop.

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2 Answers

Battery keeps going dead


I do not know what it is drawing for parasitic drain but it should only consume about 30-40 milliamperes (mA) of current. If it is draining the battery that fast there must be a problem. If it is equipped with any aftermarket equipment, that is where I would start.

When trying to trouble shoot parasitic drain you need to hook up an ammeter (measures current i.e amps) between your positive terminal of the battery and the positive cable (make sure it is not still connected to the battery). For this you should use a good quality meter that is capable of measuring small amounts or current. All lights and equipment should be turned off and the ignition should be off.

Once that is done your meter should read whatever the parasitic dray is. Watch your meter and begin systematically removing fuses, do this one at a time and make sure to replace them. Once you remove a fuse and the current drops you have isolated the faulty circuit.

Once you have isolated the faulty circuit you can further trouble shoot that circuit by disconnecting specific components that are powered by that circuit.

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