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-   -   fuse box confusion (http://forums.pelicanparts.com/porsche-911-technical-forum/1139208-fuse-box-confusion.html)

gdp_samson 05-01-2023 05:27 AM

fuse box confusion
 
Hi,

in preparation to ever install a mini blade fuse box like Classic Retrofit or Adapt, I thought to dive into the fuse box a first time (1988 3.2 hasn't had electrical issues since I bought her several years ago...).

After some reading and the Joe Engineer video about his ADAPT fuse box installation

I was ready to find a similar fuse box with 21 connections

3 - 10 - 8

but that was not the case...I had like intermediate connections without a fuse ?
so I counted more than 21 ...

http://forums.pelicanparts.com/uploa...1682947548.png

Anyone has an idea what this is ?

I also found some wires connected at the bottom without a fuse...and on the other hand, did not find the headlight relays although this US car had been modified to EU specs 15 years ago apparently...

gdp_samson 05-01-2023 05:31 AM

couldn't find my picture in the first post, sorry for that...
 
http://forums.pelicanparts.com/uploa...1682947836.jpg

PeteKz 05-01-2023 11:49 AM

Every once in awhile I think about upgrading my 1973 fuse blocks to the Classic Retrofit or Adapt ones, and then I think about the warning, "if it ain't broke, don't fix it!" You could end up causing yourself more trouble than you avoid. Those bullet fuses are a crappy design, but if you just change them every 10 years or sooner, you won't have many fuse problems. Much easier and cheaper and less likely to break something that isn't broken.

Now, if yer doing a whole electrical rewiring project anyway, then yeah, I'd put in the blade fuse blocks.

HarryD 05-01-2023 12:43 PM

Quote:

Originally Posted by gdp_samson (Post 11987618)
Hi,

in preparation to ever install a mini blade fuse box like Classic Retrofit or Adapt, I thought to dive into the fuse box a first time (1988 3.2 hasn't had electrical issues since I bought her several years ago...).

After some reading and the Joe Engineer video about his ADAPT fuse box installation

I was ready to find a similar fuse box with 21 connections

3 - 10 - 8

but that was not the case...I had like intermediate connections without a fuse ?
so I counted more than 21 ...

http://forums.pelicanparts.com/uploa...1682947548.png

Anyone has an idea what this is ?

I also found some wires connected at the bottom without a fuse...and on the other hand, did not find the headlight relays although this US car had been modified to EU specs 15 years ago apparently...

[warning]If you do not take the time to understand German wiring philosophy, please step away from the fuse box [/warning]

Get a factory wiring diagram. It will identify which fuses are jumper together under the fuse box. This will explain all.

GH85Carrera 05-01-2023 01:25 PM

Quote:

Originally Posted by HarryD (Post 11988062)
[warning]If you do not take the time to understand German wiring philosophy, please step away from the fuse box [/warning]

Get a factory wiring diagram. It will identify which fuses are jumper together under the fuse box. This will explain all.

Read that again, and print it out.

The fuse box in our 911s is just not like American cars. Just be careful.

gdp_samson 05-01-2023 09:28 PM

I have a wiring diagram, but none include the changes that some previous owner(s) made...

I just wanted to know if it was rather 'common' to see added screws / connections on the top of the fuse box row...

On the other hand: indeed, nothing seems broken now, so maybe better to step away from this :rolleyes:

Dpmulvan 05-02-2023 05:31 AM

Quote:

Originally Posted by gdp_samson (Post 11988417)
I have a wiring diagram, but none include the changes that some previous owner(s) made...

I just wanted to know if it was rather 'common' to see added screws / connections on the top of the fuse box row...

On the other hand: indeed, nothing seems broken now, so maybe better to step away from this :rolleyes:

Blade fuse sockets are like a $1 a piece, I’m going to see if I can come up with a way to just replace the fuses and use the factory board. Like the others said if it’s not broke don’t fix it.

darrin 05-02-2023 05:42 AM

Quote:

Originally Posted by gdp_samson (Post 11988417)
I have a wiring diagram, but none include the changes that some previous owner(s) made...

I just wanted to know if it was rather 'common' to see added screws / connections on the top of the fuse box row...

On the other hand: indeed, nothing seems broken now, so maybe better to step away from this :rolleyes:

Believe the added connections you're seeing come from the factory that way (they're bridged behind the panel) -- my '86 targa has the same ones shown in your picture. I'm in agreement with others' sentiment on this issue, "if it ain't broke . . " I proactively replaced all of my bullet fuses a few years ago and cleaned the connectors up with a wire brush to remove oxidation at their contact points -- fusebox still behaving like a champ.

OTOH, If your car doesn't have a headlight relay installed, I'd strongly recommend tackling this project asap (before you start having issues with your high beam switch)

porschedude996 05-02-2023 10:41 AM

I thought about updating the fuse blocks. Over the years with several different 911’s with bullet fuses, I have not had many problems. On my new project, 1983 911SC, I changed out the ceramic fuses with torpedo glass fuses. They seem to me a bit better with regard to corrosion. Bussmann GBC’s. I found them on ebay.http://forums.pelicanparts.com/uploa...1683052728.png
http://forums.pelicanparts.com/uploa...1683052837.jpg

Jonny H 05-02-2023 01:42 PM

Quote:

Originally Posted by gdp_samson (Post 11987618)
Hi,

in preparation to ever install a mini blade fuse box like Classic Retrofit or Adapt, I thought to dive into the fuse box a first time (1988 3.2 hasn't had electrical issues since I bought her several years ago...).

After some reading and the Joe Engineer video about his ADAPT fuse box installation

I was ready to find a similar fuse box with 21 connections

3 - 10 - 8

but that was not the case...I had like intermediate connections without a fuse ?
so I counted more than 21 ...

http://forums.pelicanparts.com/uploa...1682947548.png

Anyone has an idea what this is ?

I also found some wires connected at the bottom without a fuse...and on the other hand, did not find the headlight relays although this US car had been modified to EU specs 15 years ago apparently...

There is a bit about the 'intermediate' fuses on page 7 of our install manual here:

https://www.classicretrofit.com/pages/manuals-and-software

(p.s. You won't find headlamp relays on any standard air cooled 911 - that's why we add them to our panel)

PeteKz 05-02-2023 09:48 PM

Quote:

Originally Posted by porschedude996 (Post 11988811)
I thought about updating the fuse blocks. Over the years with several different 911’s with bullet fuses, I have not had many problems. On my new project, 1983 911SC, I changed out the ceramic fuses with torpedo glass fuses. They seem to me a bit better with regard to corrosion. Bussmann GBC’s. I found them on ebay.

Thumbs up on those too.

darrin 05-03-2023 05:32 AM

Quote:

Originally Posted by PeteKz (Post 11989274)
Thumbs up on those too.

I went with the stainless torpedo fuses a few years ago as well. At the time, folks expressed concern that the stainless fuses might react with the brass terminals. I've kept a close eye on this and so far, no problems at all.

gdp_samson 05-04-2023 09:33 PM

Quote:

Originally Posted by Dpmulvan (Post 11988525)
Blade fuse sockets are like a $1 a piece, I’m going to see if I can come up with a way to just replace the fuses and use the factory board. Like the others said if it’s not broke don’t fix it.

I think many are very interested to go that way...I'll be watching you :D

gdp_samson 05-04-2023 09:34 PM

Quote:

Originally Posted by porschedude996 (Post 11988811)
I thought about updating the fuse blocks. Over the years with several different 911’s with bullet fuses, I have not had many problems. On my new project, 1983 911SC, I changed out the ceramic fuses with torpedo glass fuses. They seem to me a bit better with regard to corrosion. Bussmann GBC’s. I found them on ebay.http://forums.pelicanparts.com/uploa...1683052728.png
http://forums.pelicanparts.com/uploa...1683052837.jpg

these are a simple replacement ? they fit in the same area without any change whatsoever ?

gdp_samson 05-04-2023 09:36 PM

Quote:

Originally Posted by Jonny H (Post 11988990)
There is a bit about the 'intermediate' fuses on page 7 of our install manual here:

https://www.classicretrofit.com/pages/manuals-and-software

(p.s. You won't find headlamp relays on any standard air cooled 911 - that's why we add them to our panel)

good point, don't have headlight relay and could buy one (85 EUR) but then again, this is integrated in your fuse box (so that would not cost me 340 EUR then, but 340 minus the 85)... at least, that's the argument I'm gonna use towards my wife :rolleyes:

HarryD 05-04-2023 10:48 PM

Quote:

Originally Posted by gdp_samson (Post 11991266)
good point, don't have headlight relay and could buy one (85 EUR) but then again, this is integrated in your fuse box (so that would not cost me 340 EUR then, but 340 minus the 85)... at least, that's the argument I'm gonna use towards my wife :rolleyes:

Are you referring to the factory headlight relay or the aftermarket one to isolate the flasher stalk from the headlight current?

gdp_samson 05-05-2023 07:05 AM

https://www.kroonwireharnesses.com/porsche-911/porsche-911-1988/headlight-relay-set-for-porsche-911-74-88-version?sort=p.price&order=ASC

HarryD 05-05-2023 07:37 AM

Ok.

Our host May be less expensive. https://www.pelicanparts.com/More_Info/JWST911HLPR.htm?pn=JWST-911-HLPR&bc=c&SVSVSI=0577

gdp_samson 05-05-2023 08:44 AM

Quote:

Originally Posted by HarryD (Post 11991525)

the shipping to and import taxes in Belgium will make it horribly expensive I'm afraid...time to launch a PelicanParts Europe :confused:

HarryD 05-05-2023 08:48 AM

Quote:

Originally Posted by gdp_samson (Post 11991597)
the shipping to and import taxes in Belgium will make it horribly expensive I'm afraid...time to launch a PelicanParts Europe :confused:

Ok. Makes sense.


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