Understanding fuse panel wiring jumpers

[fpvga]

Hey y’all. I’m about to upgrade my fuses using the Classic Retrofit panel, which seems quite nice. But the jumpers on my panel don’t match the jumper/connected terminals on the new panel. Which also makes me realize I don’t really understand why the hot side of the fuse panel is jumpered at all. What would be the point of the hot sides of multiple circuits being connected together? How should I think about rearranging the wiring on the hot sides? Thanks for any tips, I’m a little confused...

[fpvga]

[sigchuck]

Maybe not on point to your question, but when I installed the CR panel I didn’t think the jumpers were used. In any event, I followed the online instructions (except I found it much easier to start at the rear of the panel and work forwards) and mine has been working great for a year/6k or so miles. Good luck and be sure to take very detailed pictures of panel/wiring before you start! My pictures saved me a couple of times.

[rattlsnak]

Having them jumpered on the hot side of the fuse is fine. The load carrying segment of the circuit is protected downstream by the fuse. (It's assumed that if a problem/short were to occur, that it probably won't happen in the short distance from the battery to the fuse panel but on the other side where the wires go throughout the body and of course the load carrying object itself.

[Ian Comerford]

You may find, as I did, that anything non-standard or in a non-standard position will not work correctly when you wire in the new panel. I had to figure out a work around or the fuel pump to get the car to a more knowledgeable Porsche electrician who noted that the fuel pump wiring was ina different place to normal. When he repositioned it to the standard position the car was fine. Jonny's panel has some built in bridges/jumpers I believe. Hope this makes sense

[fpvga]

Thanks all. So yeah, I am trying to decide if I want to rejigger things to make sure to go back to OEM positions (and risk causing issues), or just leave it as is and expect it to continue to work, even if not the original setup...

[sigchuck]

When you mention jumpers, are you referring to the wires that run from one position to the next, or the hard copper jumpers? I confirmed that the hard copper jumpers were definitely not used in my installation (which was pretty by the book from what I remember), but I did reinsert all wires (including any jumper wires) back into the slots they came out of.

[2jmotorsports]

They are included in the fuse block board. You can see them in between the rectangular upper posts the screws go into. You should also be able to see them through the backside of the board or do a continuity test with a multimeter from terminal to terminal to verify that the terminals are indeed connected together without a need for the external jumpers.

Also step 8 in the instructions addresses this very topic: https://www.classicretrofit.com/pages/manuals-and-software

[86 911 Targa]

^^^^^
For our '86.

Gerrry

[Jonny H]

Hi guys, both the busbars and the jumpers are integrated into our panels.

I made this video - might help to clarify:

https://youtu.be/YQVt_dnfXEg

[fpvga]

Just closing the thread here — got everything wired up and sorted out with no problems, all the integrated bus bars are in the right spots and I managed to not make a rats nest! Great product.

[fpvga]

Oh and a pic, I made a pecan window to see if any fuses are blown without taking the cover off. You know, projects.

[timmy2]

Looks nice. The “pecan” (lexan) window is cool.

[fpvga]

Originally Posted by timmy2

Looks nice. The “pecan” (lexan) window is cool.

Autocorrect is always an adventure. Cashew later.

[timmy2]

Lol,