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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 07-17-2008, 11:27 AM   #1
tradingflare
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How to properly jump start an E46?

The 15 threads going on with regard to cluster boy and his 600,000 miles on the odometer had me thinking. An improper jump start could easily fry the ECU on an E46. While we all take precaution and use good judgment when replacing our batteries, the time will come when we have to jump start them.

So, how do you do it on these cars?

1. What is the process? I see the red terminal "box" under my hood...
2. Which terminals do we connect first, and which car gets connected first?
3. Where do we ground the black cable on the E46? (frame?)
4. Which terminals do we disconnect, and which car gets disconnected first?
5. Is it safer to jump start from car to car, or from a "jumper box"...ya know, those portable battery-charger-and-jump-start-thingies.

Sounds noobish, and it is, but I'm sure someone reading this finds it beneficial to know.
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Old 07-17-2008, 11:32 AM   #2
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Quote:
Originally Posted by tradingflare View Post
The 15 threads going on with regard to cluster boy and his 600,000 miles on the odometer had me thinking. An improper jump start could easily fry the ECU on an E46. While we all take precaution and use good judgment when replacing our batteries, the time will come when we have to jump start them.

So, how do you do it on these cars?

1. What is the process? I see the red terminal "box" under my hood...
2. Which terminals do we connect first, and which car gets connected first?
3. Where do we ground the black cable on the E46? (frame?)
4. Which terminals do we disconnect, and which car gets disconnected first?
5. Is it safer to jump start from car to car, or from a "jumper box"...ya know, those portable battery-charger-and-jump-start-thingies.

Sounds noobish, and it is, but I'm sure someone reading this finds it beneficial to know.
I had to do this from a 'battery box' when my dad's E46 wouldn't start.

First you connect the red cable to the remote terminal under the hood. Then there is another exposed nut to connect the ground (black cable) to.

After starting, you disconnect it in the reverse order.
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Old 07-17-2008, 12:13 PM   #3
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yeah...follow the same procedure You would with any other car...

red to red, black to ground (on the car being jumped)

disconnect is the reverse
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Old 07-17-2008, 12:17 PM   #4
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Follow this guide:
http://www.edmunds.com/ownership/how...3/article.html

But when receiving or giving jump starts, hook cables up directly to the battery in the trunk.

Avoid using the terminals in the engine bay.
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Old 07-17-2008, 12:44 PM   #5
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Originally Posted by NorCal Einstein View Post
Follow this guide:
http://www.edmunds.com/ownership/how...3/article.html

But when receiving or giving jump starts, hook cables up directly to the battery in the trunk.

Avoid using the terminals in the engine bay.
Why? Electronically, it doesn't matter where the terminals are. They could be a town away and the battery wouldn't know.
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Old 07-17-2008, 12:49 PM   #6
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Same as any other car - but it is spelled out for you in the manual - step by step if you need it
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Old 07-17-2008, 02:30 PM   #7
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wat? Im cluster boy now?
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Old 07-17-2008, 02:32 PM   #8
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Originally Posted by NorCal Einstein View Post
Follow this guide:
http://www.edmunds.com/ownership/how...3/article.html

But when receiving or giving jump starts, hook cables up directly to the battery in the trunk.

Avoid using the terminals in the engine bay.
DON:T hook up to the battery on any car that has a IBS on the negative terminal that will cause alot of issues!! We don;t even charge car from the battery becasue of that reason.
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Old 07-17-2008, 02:41 PM   #9
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Originally Posted by NorCal Einstein View Post
Follow this guide:
http://www.edmunds.com/ownership/how...3/article.html

But when receiving or giving jump starts, hook cables up directly to the battery in the trunk.

Avoid using the terminals in the engine bay.
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Originally Posted by jbeurotech View Post
DON:T hook up to the battery on any car that has a IBS on the negative terminal that will cause alot of issues!! We don;t even charge car from the battery becasue of that reason.


The second guy is correct. Due to the battery fluid consisting of Sulfuric acid (H2SO4), it has a tendency to give off hydrogen as it dies. Since jump starting a car normally means its battery is dead, that means you'll be making and breaking electrical connections in the presence of (possible) leaked hydrogen. Does that sound like fun to you?

that's what the engine terminals are for. To stay as far away from the battery as possible. Plus you never hook up to the negative side of the battery, instead you use ground. (frame or designated grounding bolt under the hood)


"Johny was a chemist's son, but Johny is no more. What Johny thought was H20 was H2SO4."
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Old 07-17-2008, 02:41 PM   #10
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wat? Im cluster boy now?
i think it's time to change your user name...!
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Old 07-17-2008, 02:53 PM   #11
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wat? Im cluster boy now?
we could just call You cf




...not carbon fiber...
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Old 07-17-2008, 03:02 PM   #12
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Quote:
Originally Posted by jbeurotech View Post
DON:T hook up to the battery on any car that has a IBS on the negative terminal that will cause alot of issues!! We don;t even charge car from the battery becasue of that reason.
Quote:
Originally Posted by Poon Stick View Post
The second guy is correct. Due to the battery fluid consisting of Sulfuric acid (H2SO4), it has a tendency to give off hydrogen as it dies. Since jump starting a car normally means its battery is dead, that means you'll be making and breaking electrical connections in the presence of (possible) leaked hydrogen. Does that sound like fun to you?

that's what the engine terminals are for. To stay as far away from the battery as possible. Plus you never hook up to the negative side of the battery, instead you use ground. (frame or designated grounding bolt under the hood)


"Johny was a chemist's son, but Johny is no more. What Johny thought was H20 was H2SO4."
Whoa, didn't know that.

I was almost certain I read somewhere to not jump it from the engine terminals....
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Old 07-17-2008, 03:08 PM   #13
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we could just call You cf




...not carbon fiber...

... cluster fail?
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Old 07-17-2008, 03:49 PM   #14
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... cluster fail?
Cluster fcuk... come on, now!
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Old 07-17-2008, 03:49 PM   #15
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cluster fuked, jeez
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Old 07-17-2008, 08:31 PM   #16
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i jumped mine the same way ive jumped every car my whole life, whats the problem? battery to battery
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Old 07-17-2008, 08:33 PM   #17
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Quote:
Originally Posted by NorCal Einstein View Post
Follow this guide:
http://www.edmunds.com/ownership/how...3/article.html

But when receiving or giving jump starts, hook cables up directly to the battery in the trunk.

Avoid using the terminals in the engine bay.
So are the jumper posts in the engine bay just for looks?
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Old 07-17-2008, 08:34 PM   #18
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wat? Im cluster boy now?
Just breaking balls, no biggie...
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Old 07-17-2008, 08:37 PM   #19
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"Johny was a chemist's son, but Johny is no more. What Johny thought was H20 was H2SO4."
I love that one.
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Old 11-01-2013, 01:59 PM   #20
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this post is confusing and not helpful at all...can we get back on topic please
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