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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 12-01-2013, 10:45 PM   #1
Registered User
Join Date: Jul 2011
Location: SoCal - LA-IE
Posts: 2
My Ride: 2003 325i
DIY - Pictorial Replace B+ Terminal (positive connection under the hood)

This was performed on my 2003 325i.

Hello to every BMW/CAR enthusiast out there and thanks you for taking the time on checking out my first DIY (as i wasn't able to find this online). Also, thank you to all the DIYers and commenters everywhere as I have used a few DIY on this site so I want to pay it forward with mine.

Hopefully the title/description makes sense of what I would like to share as I am using references from RealOEM.com (awesome site!).This DIY will have pictures as i find DIY with pictures a lot more helpful. This is simple DIY and no special tools needed and can take under 20-30min (i bet even less). It took me about 45min as I had no clue on what i was doing and i was taking pictures along the way. I am not a mechanic nor do i have any past mechanic background/knowledge. With this being said this is really simple to do.

I placed my order with www.PelicanParts.com but don't forget to check out www.ecstuning.com (based in Ohio) and www.autohausaz.com (based in Arizona).

large/hi-res and more detailed images can be found on my drop box….

Downloadable versions
Word Format -
PDF Format -
Web Site Format -

If the links above don't work or have any questions please email me and let me know i can re-upload the images, fix the links and/or answer any questions you may have. My email address is phern007@gmail.com.

I believe my issue started to happen when I installed the MyCarr Angle Eyes Kit that i purchased from Bimmian.com as that is only time i have messed with the B+ terminal. However, it is a possibility it could be a relay or i just didn't properly install them correctly (instructions on the box suck) and i found the proper way of installing them on this site after my terminal became FUBAR.

the image above demonstrates the DIY before (below) and after (above)

Tools Needed:
  1. Rachet
  2. 10mm Socket
  3. 13mm Socket
  4. BMW Stock Channel Locks
  5. BMW Stock Screwdriver

Parts List and Diagram

link to diagram above: http://www.realoem.com/bmw/showparts...09&hg=61&fg=30
The correct part number for the Hex Nut M8 thread (#5):
Real OEM #07149125856
Pelican Parts# 07-14-9-125-856-BOE

B+ terminal point
(I haven’t replaced this...yet)

Link to diagram above:

The correct part number needed for the B+ terminal
(positive connection terminal under the hood)
Real OEM #61131382548
Pelican Part# 61-13-382-548-BOE

Lets begin the DIY:

1. Disconnect the battery using the 10mm socket.

Yup, thats a gel based Duralast battery and cardboard to keep a little more tension. I purchased the battery at my local auto parts store (Autozone) for $100 (regular $160-$200) due to my other Duralast battery failing, still under warranty and discontinued.

2. Remove the hex nut

(I know this is bad and luckily nothing major happened like my hood liner catching on fire or frying a part of my electrical system)

3. Remove hood sensor

4. Remove fastener

Dont use a screwdriver to pry out the fastener as it will break. I broke it due to not knowing what i was doing and also I purchased the fastener.
The back part and the front part slide out releasing the tension on the fastener.
Hopefully the image below makes sense.

5. Remove the weather strip out the way for step 6.

6. Remove the 13mm nut from the back of the B+ terminal
Tip: I found it easier to put it back where it goes to get more torque on removing and install the nut.

inspect the cable…. mine is good so no need to do anything.

7. Install new B+ terminal and connect back of the box.

8. install the fastener
Tip: install the fastener before putting on the back part.
Slide the back part down to secure the fastener in place.

9. connect the B+ hex nut and put back the weatherstip

10. Reconnect battery and you are done!

Hope you found this DIY useful.
Please feel free to comment and contact me if you need anything else.
Thanks and happy Tunning!
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Old 12-02-2013, 12:07 PM   #2
///M Protocol
Banned User
Join Date: Sep 2013
Location: KC
Posts: 349
My Ride: i3
wondering what is causing the B terminal to arc and melt
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Old 12-02-2013, 01:25 PM   #3
Registered User
Join Date: Jul 2011
Location: SoCal - LA-IE
Posts: 2
My Ride: 2003 325i
Originally Posted by ///M Protocol View Post
wondering what is causing the B terminal to arc and melt
I am not 100% sure as I have a good feeling it might be the MyCarr Angle Eyes kit as that is the only time I actually tapped into this terminal. It might be the relay, not proper ground or not installing them properly. I did piggy back one of the cables to my dome lights under my glove box to get the fade in/fade ring light up when you lock/unlock the car. I checked my fuses, connections and alternator but they all checked out fine. I did take my battery to be tested as I thought that was the root cause but when I replaced it, the issue was still there. I just replied it yesterday and took it for about a 10 mile run and it seems OK.

I am really curious on hearing some ideas or what i should check on any fellow tuners out there will avoid this issue that can be a nightmare or even worse a possible fire hazard.

I will wait until I hit a few hundred miles for an official update.

Oh yeah, I forgot to mention above, this all stared while I was driving my battery light come on, stayed light, diapered, blinked, car did not start smoothly, left me stranded a few times, my radio started sounding like I was listening to a scratched CD even though I had my iPod connected. I wiggled the cable a few times and cleaned the terminal but still no official conclusion on what the root cause is. As of today I do not have the halos connected and will re install at a later time (if I even decide to attempt it).

my personal website
My first DIY Pictorial Replace B+ Terminal (positive connection under the hood)

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Old 10-22-2014, 11:08 PM   #4
Registered User
Join Date: Apr 2013
Location: Melbourne, Australia
Posts: 251
My Ride: 318i n46 e46, e34 M5
Had this happen to mine a while back though it was the rear connector or the terminal not the jump point...

You don't happen to know the part number for the 13mm nut on the rear of the terminal, tried all of the regular nuts from the local hardware store but I'm pretty sure it has specific threading on it....
matt0 is offline   Reply With Quote

b+, battery, positive, terminal, underhood

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