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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 03-31-2013, 06:13 PM   #21
Yewzer B Lewzer
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I agree with most of the later posts: you have a resistance somewhere in your electrical system. I suspect the neg batt terminal due to the description you made. Battery terminals should always be removed, cleaned (wire brush or mild sandpaper), and reinstalled not just tightened. They will get a layer of corrosion that tightening will not solve. You can "test" this by putting one probe of the volt meter on the batt lug, and the other on the battery clamp (on the cable end) and see if you have a voltage drop with, say, the headlights on. The volt meter shouldn't read more than a couple tenth of a volt (preferably less). You can test any connection this way, by measuring voltage drops accross the connection.
You state that you have 14 volts all the time (I assume this is at the battery measured by a voltmeter) but the gauge on the dash shows that it drops when you put the headlights on. There is definately a resistive connection somewhere, just a matter of finding it.
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Last edited by Yewzer B Lewzer; 03-31-2013 at 06:16 PM.
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Old 03-31-2013, 06:25 PM   #22
Stinger9
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Quote:
Originally Posted by Yewzer B Lewzer View Post
I suspect the neg batt terminal due to the description you made. Battery terminals should always be removed, cleaned (wire brush or mild sandpaper), and reinstalled not just tightened.
+1
All possible cable connections must be checked.
They make a 99 cent battery terminal cleaner (male and female combo) that should always be used when a clamp is loosened. Clean the battery stud and inside the clamp connector.
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Old 03-31-2013, 08:14 PM   #23
Drayko
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The battery is brand new, 3 days old and I just got done putting brand new terminals on it so I know it's not that... But I will go and get everything checked. I just didn't wana go through the hassle of a garage and the money...
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Old 03-31-2013, 09:19 PM   #24
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The battery is brand new, 3 days old and I just got done putting brand new terminals on it so I know it's not that... But I will go and get everything checked. I just didn't wana go through the hassle of a garage and the money...
Can't you check things yourself?
Know how to use a voltmeter/ohmmeter?
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Old 03-31-2013, 09:20 PM   #25
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I don't have one
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Old 03-31-2013, 09:27 PM   #26
Stinger9
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Cheap one from Radio Shack or Amazon ($25) would do all you need for this level of troubleshooting if you know how to use it. And so many of us here would gladly coach you?

http://www.radioshack.com/family/ind...odsInSession=1

http://www.amazon.com/Mastech-Analog...rds=multimeter

Last edited by Stinger9; 03-31-2013 at 09:56 PM.
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Old 03-31-2013, 09:28 PM   #27
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The battery is brand new, 3 days old and I just got done putting brand new terminals on it so I know it's not that... But I will go and get everything checked. I just didn't wana go through the hassle of a garage and the money...
What do you mean 'you put new terminals on your new battery'?

Also, new batteries don't always come fully charged.

You said you disconnected the stereo because sub was causing car to stop? Make sure, if testing the theory that it's subs, that you disconnect the system, not just disconnect part of it.

GL...lots of good suggestions in this thread...check those connections. Then, figure it's either incorrect wiring of your aftermarket things, or an issue with an aftermarket thing.
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Old 03-31-2013, 09:55 PM   #28
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What do you mean 'you put new terminals on your new battery'?

Also, new batteries don't always come fully charged.

You said you disconnected the stereo because sub was causing car to stop? Make sure, if testing the theory that it's subs, that you disconnect the system, not just disconnect part of it.

GL...lots of good suggestions in this thread...check those connections. Then, figure it's either incorrect wiring of your aftermarket things, or an issue with an aftermarket thing.
I put new terminals on the cables that connect to the battery, and yes I disconnected the entire system. I'll get one of those volt meters tomorrow and spend the day tinkering with her
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Old 04-01-2013, 05:26 AM   #29
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I put new terminals on the cables that connect to the battery, and yes I disconnected the entire system. I'll get one of those volt meters tomorrow and spend the day tinkering with her
Ah, sorry, on the cables. Not to question your experience, but have you done that before and why did you do this in the first place? I'd consider 'this' as being a possible reason for your issue--the clamping force on factory cables has to be enormous--I know you can add terminals, but on your own, if you don't have a specific tool for doing that, you may likely not have good a connection there as you think.

I like proximate causes, Dray, so whenever I hear someone has done something 'after market' I always suspect that as a cause to the issues they're having. You've done this, added a sub and probably monster amp.

Also, I second the thought mentioned earlier that usually the guys at Autozone aren't ones you should regard as automotive experts.

...and a bump for you!
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Old 04-01-2013, 06:29 AM   #30
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If you want your problem fixed, you need to buy a Voltmeter. You have invested money in stereo gear, sub woofers and amps, buy a Voltmeter.

The next thing you need to do is read the 4th link below in my signature and display the battery/charging Voltage directly on the dashboard.

You then need to learn about Voltage drop and figure out how to use jumper cables to bypass/augment connections for trouble shooting purposes.

Search the Internet/YouTube and learn about Voltage drop.

Suggest you read this thread entirely as well - http://www.e46fanatics.com/forum/sho...d.php?t=886274
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299

Last edited by jfoj; 04-01-2013 at 06:29 AM.
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Old 04-01-2013, 04:24 PM   #31
Drayko
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ok just thought i would throw this in as well and that maybe one of these issues might be my problem as well? i went and got my codes looked at and it came back with:

P0172 System to rich bank 1
P0161 Heater circuit
P0175 System to rich bank 2
P0313 Misfire with low fuel
P1193

would any of these possibly have anything to do with my issue?
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Old 04-01-2013, 04:44 PM   #32
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See the first 2 links below in my signature.

Not likely these are related to your charging problem, assuming you have a charging problem.

Did you read the 4th link in my signature and display the battery/charging Voltage on the dash??
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 04-01-2013, 05:08 PM   #33
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its not a charging problem, i just loose power for a short sec when i turn something on. and especially when my bass hits it goes from 14 volts to 11 volts which shouldn't be happening with the new digital amps that dont draw power like that.
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Old 04-01-2013, 05:26 PM   #34
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OK, lets talk about this.

1. You have no Voltmeter?
2. You failed to pay attention in science and physics class.
3. You have some big amp for your subwoofer.
4. Somehow you THINK since you have a digital amp it will not need a large instantaneous amount of power for your bass amplifier?? But even your measurements indicate your amp required a large amount of current for the bass transients.

In case you do not understand, there is not free lunch in the Scientific world. Seems this proves line #2??

Your amp is either drawing a lot of current during bass transients and/or you have connected the amp to some location where the wiring supporting the amp is too small and you have too much Voltage drop.

Have you measured the current consumption of your amp during bass transients?? This will pretty much answer the question.

What size wiring are you using for the amp?

Where is the amp power wiring connect to in the car?

Are you aware that a car battery cannot typically provide the instantaneous current that an amplifier may need? This is why you run large capacity input capacitors as they have the ability to charge and discharge must faster than a battery.

What type of battery do you have in your car? Standard lead/acid, Deep cycle, AGM??

Also are you running any storage capacitors on the amp DC input?? Likely you need them.

Seems that you do not have an E46 or a BMW problem, you likely have an aftermarket car audio system installation problem.

Maybe you are on the wrong type of forum.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 04-01-2013, 05:43 PM   #35
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Asshole? I clearly stated the power loss problem still happens without any stereo system hooked up, also I have also connected another battery to see if that would solve the problem and still the same results. And at the moment my stereo has not been hooked up.for weeks
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Old 04-01-2013, 05:45 PM   #36
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Kicker dx1000 look it up
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Old 04-01-2013, 05:54 PM   #37
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Jfoj, I agree with everything you said almost except the capacitor part. Extra battery>capacitor every time.

Anyways I'm running a mmats 2000. Even before the second battery the lights only dimmed at high volume. Something else is wrong here. Has to be a loose ground wire somewhere Or a short. Maybe voltage regulator is my thinking. You need a voltmeter for sure.
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Old 04-01-2013, 05:55 PM   #38
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Asshole? I clearly stated the power loss problem still happens without any stereo system hooked up, also I have also connected another battery to see if that would solve the problem and still the same results. And at the moment my stereo has not been hooked up.for weeks
Dude, I guess I am not going to help you any further as you seem to think I am not helpful??? I am just station the OBVIOUS.

Suggest you look at the number of posts I have on this board, and this is just 1 board I frequent. This will give you an idea of how much I contribute here. You are under 20 posts and likely they are ALL to do with this single issue.

I do not have time to fully read all the small details in every post that comes along.

You are the kind of person that only wants answers, not help.

As I tell my kids, I am ALWAYS available for help, but NEVER available for answers!!

Good luck.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 04-01-2013, 06:05 PM   #39
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I.appreciate all the help and I have read everything u told me to, u just came off as an ass on that last one... And where would I locate this voltage regulator and how exactly do I test it with the volt meter that I'M PICKING UP TOMORROW lol
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Old 04-01-2013, 06:05 PM   #40
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OK, lets talk about this.

Maybe you are on the wrong type of forum.
Sometimes it has to hurt before it feels better.

And attitude doesn't engender help from a person with all the knowledge.

Last edited by Stinger9; 04-01-2013 at 06:06 PM.
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