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Fuse Box - what lies beneath?


PhilC

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3 hours ago, PhilC said:

Do you mean there are jumpers on the original box

Phil,

 

If you have the original 12-fuse box in your '75, the following fuses are jumped on the "hot" (feed) side of the fuse holders:

 

Fuses 1 & 2     Red wire always hot from ignition switch and battery +.

Fuses 3 & 4    Green wire switched +12V from ignition switch (15). Also Green wire to "hot" side of Fuse #12.

Fuses 5 & 6    Violet wire switched +12V from ignition switch (R).

Fuses 9 & 10   Yellow wire from Low-Beam relay (87).

 

Did you have to add anything when you installed the M42 engine?

 

Cheers,

John

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6 minutes ago, John76 said:

Phil,

 

If you have the original 12-fuse box in your '75, the following fuses are jumped on the "hot" (feed) side of the fuse holders:

 

Fuses 1 & 2     Red wire always hot from ignition switch and battery +.

Fuses 3 & 4    Green wire switched +12V from ignition switch (15). Also Green wire to "hot" side of Fuse #12.

Fuses 5 & 6    Violet wire switched +12V from ignition switch (R).

Fuses 9 & 10   Yellow wire from Low-Beam relay (87).

 

Did you have to add anything when you installed the M42 engine?

 

Cheers,

John

Thank you that’s helpful.

I didn’t have the engine installed so your guess is a good as mine 😂

I have e-mailed classicretrofit and bought a fuse box to examine and get an idea of how it’s put together.

Phil

1975 1602 with an M42 engine.

Project thread http://www.02forum.co.uk/viewtopic.php?f=11&t=14853#p107713

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Realistically you can clean up the old box and call it good, but where’s the fun in that? I always like a challenge, so I decided to see if I could modernize. 
 

I found a bottom feed panel that fits perfectly, just needed a few holes drilled. It’s a Bussman 15305-4-0-4 that uses MiniATM blade fuses and is fully sealed top and bottom. Plus it gives me slots for 20 circuits. Massive improvements on every level. 
BE51BE1D-79DE-4158-99A4-AFD434F74C95.thumb.jpeg.3112d68839b4243a66aff9ba02ffb2da.jpeg
 

Then comes the fun part. You make this:

0D2D36F2-50CA-4851-8DA8-1C7BF0771445.thumb.png.ddd56fd5a626c7c0e131968c49398f07.png

 

Into this:

60E840BE-0B92-464E-BE32-4E83FFA2B8EE.thumb.jpeg.5633a7541e9c9b4ede5cbad9c4c8130a.jpegCC8E3D77-1C99-444D-A4B2-D2A289DC6DB9.thumb.jpeg.9770d87d50fc1878d1d06110b5429b58.jpeg

Not sure what took longer, making the diagram or the actual fuse box and harness.  Probably the diagram. Time spent planning was key in reducing time spent fixing mistakes. 
 

Then all the plugs got clipped off the factory harness and the wires got rerouted into the new sealed plugs:

CA86354A-23C1-4F8D-ADF9-A2CFB6818B7B.thumb.jpeg.4e9bbd2c23862b74d8f34d5d821afc2c.jpeg

 

Final step, plugging it all in, screwing it down, and hoping you mapped everything correctly. 
440CF9CD-9B4E-4FD2-8D37-58504456E59D.thumb.jpeg.6d7515a1de9a47bdd7ca8f7b8daab894.jpeg
 

Works like a charm. Gave me the extra slots I needed and no more green ‘patina’ growing in the fuse box. Considering that I was making this all up with no roadmap, I was pretty proud of the effort. It was a great way for me to learn the electrical system…intimately.  And who doesn’t like printing custom stickers. 😉

 

G

 

Oh, and I was out the door for $170 from Waytek Wire. Not bad, really. 

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1 hour ago, Lucky 7 said:

Realistically you can clean up the old box and call it good, but where’s the fun in that? I always like a challenge, so I decided to see if I could modernize. 
 

I found a bottom feed panel that fits perfectly, just needed a few holes drilled. It’s a Bussman 15305-4-0-4 that uses MiniATM blade fuses and is fully sealed top and bottom. Plus it gives me slots for 20 circuits. Massive improvements on every level. 
BE51BE1D-79DE-4158-99A4-AFD434F74C95.thumb.jpeg.3112d68839b4243a66aff9ba02ffb2da.jpeg
 

Then comes the fun part. You make this:

0D2D36F2-50CA-4851-8DA8-1C7BF0771445.thumb.png.ddd56fd5a626c7c0e131968c49398f07.png

 

Into this:

60E840BE-0B92-464E-BE32-4E83FFA2B8EE.thumb.jpeg.5633a7541e9c9b4ede5cbad9c4c8130a.jpegCC8E3D77-1C99-444D-A4B2-D2A289DC6DB9.thumb.jpeg.9770d87d50fc1878d1d06110b5429b58.jpeg

Not sure what took longer, making the diagram or the actual fuse box and harness.  Probably the diagram. Time spent planning was key in reducing time spent fixing mistakes. 
 

Then all the plugs got clipped off the factory harness and the wires got rerouted into the new sealed plugs:

CA86354A-23C1-4F8D-ADF9-A2CFB6818B7B.thumb.jpeg.4e9bbd2c23862b74d8f34d5d821afc2c.jpeg

 

Final step, plugging it all in, screwing it down, and hoping you mapped everything correctly. 
440CF9CD-9B4E-4FD2-8D37-58504456E59D.thumb.jpeg.6d7515a1de9a47bdd7ca8f7b8daab894.jpeg
 

Works like a charm. Gave me the extra slots I needed and no more green ‘patina’ growing in the fuse box. Considering that I was making this all up with no roadmap, I was pretty proud of the effort. It was a great way for me to learn the electrical system…intimately.  And who doesn’t like printing custom stickers. 😉

 

G

 

Oh, and I was out the door for $170 from Waytek Wire. Not bad, really. 

That is a work of art, really good, thanks for posting 👍

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Phil

1975 1602 with an M42 engine.

Project thread http://www.02forum.co.uk/viewtopic.php?f=11&t=14853#p107713

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That looks like the perfect upgrade for 12-fuse cars!  I was unable to find anything like that fuse box to jam 12 fuses in the same area of a 6 fuse car fender 'cause the sheet metal's different with a much smaller hole and no depressed area.   Excellent documentation also

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Having done a lot of searching I came across this. It’s very promising. I have left a message on the e28 forum to ask if the guy might consider one for ‘02s.

WWW.HOLYGRAILLABS.COM

Upgrade your flakey, melty, and unreliable E12, E23, E24, or E28 fuse box.  Address one of the biggest causes of electrical problems in your classic BMW—the ancient and unreliable torpedo fuses. Our kit upgrades your E12, E23, E24, or E28 to...

 

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Phil

1975 1602 with an M42 engine.

Project thread http://www.02forum.co.uk/viewtopic.php?f=11&t=14853#p107713

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  • 9 months later...
On 3/12/2023 at 6:05 AM, PhilC said:

Has anyone developed a modern replacement for the fuse box?

It seems to be a right old mess under there and with short tails it seems to be a nightmare waiting to happen if I removed it to assess whether it’s a worthwhile project or not?

Hey Phil- I just found this post from last year - just read the whole thing now.  I just spoke with the guy doing the Holy Grail Labs replacement fuse box for the E28...  he's got some stuff in the works that will definitely interest the '02 crowd.

 

The basis is a new PCB that replaces the original terminals and fuse spring clips internal to the box with a new part.  It installs through the same slots as the original, and is a very nice upgrade, with LED power indicators that can be switched on or off (link below).

 

Other models are in the pipeline... it's a large rabbit hole, as we know.

 

Meanwhile, anyone with a cranky fuse box that may be willing to test a prototype, get in touch and let's see how we can help keep the breed alive and healthy! 

 

Link to the E28 thread with this project: 

You may need to register on the site to view...

 

Andy

Edited by MoBrighta
remove spurious information

Andy the tail light guy says "Be Seen, and Not Hurt!"  [mailto:mobrighta@comcast.net]

Lighting Upgrades for E3, E9, E10, E12, E21, E23, E24, E28, E30, E32, E36, E39 - front & back
Tail Light upgrades keep them off your tail, out of your trunk;
Headlight film keeps your 'eyes' from being scratched out or broken.

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47 minutes ago, MoBrighta said:

Hey Phil- I just found this post from last year - just read the whole thing now.  I just spoke with the guy doing the Holy Grail Labs replacement fuse box for the E28...  he's got some stuff in the works that will definitely interest the '02 crowd.

 

The basis is a new PCB that replaces the original terminals and fuse spring clips internal to the box with a new part.  It installs through the same slots as the original, and is a very nice upgrade, with LED power indicators that can be switched on or off (link below).

 

Other models are in the pipeline... it's a large rabbit hole, as we know.

 

Meanwhile, anyone with a cranky fuse box that may be willing to test a prototype, get in touch and let's see how we can help keep the breed alive and healthy! 

 

Link to the E28 thread with this project: 

You may need to register on the site to view...

 

Andy

Hi Andy,

Funny you should mention this. I have been in contact with Holy Grail labs for the past year and they are sending me a prototype as we speak for me to test on my car. Galahad and I will then discuss any tweaks that may be needed. I’m quite excited to receive the new fusebox 😃

Phil

1975 1602 with an M42 engine.

Project thread http://www.02forum.co.uk/viewtopic.php?f=11&t=14853#p107713

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Hey Phil, that is good news!  Glad to see progress on this front. 

I do miss my 72, wish it hadn't gotten so rusty.

 

Andy

 

FYI - in my post above, PCB is for Printed Circuit Board... just in case there's anyone who isn't familiar with the acronym.

Edited by MoBrighta
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Andy the tail light guy says "Be Seen, and Not Hurt!"  [mailto:mobrighta@comcast.net]

Lighting Upgrades for E3, E9, E10, E12, E21, E23, E24, E28, E30, E32, E36, E39 - front & back
Tail Light upgrades keep them off your tail, out of your trunk;
Headlight film keeps your 'eyes' from being scratched out or broken.

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