Adding fuses, reworking fuseblock?

[defcon65]

My searches have not turned up the threads I'm looking for that address the project I'd like to attempt: installing additional fuses on unprotected circuits and the reworking of the fuseblock and wiring to better protect the '85 Carrera from electrical shorts (and fires). Any guidance towards this information would be greatly appreciated.

Regards,

[Wil Ferch]

Try looking at this --->

Fuse panel upgrade to ATO type

- Wil

[Wil Ferch]

I also said this in another post---->

Glascow:
There are many more electrical areas..Porsche does a really poor job in this category.
- For A/c cars....add the 7.5A fuse kit for the front condenser fan. Another fire hazard.
- add headlight relays, as mentioned
- add upgraded relay with external 16A fuse in smugglers box ( A/c system)...late 70's to late 80's cars.
- oddly *all* relays that Porsche uses ( ex: foglight relay) is fused only on the power side...not on the control side. Quick wire switcheroo will fix this.
- fuse box disaster. Design uses riveted construction of fuse holders that may get loose over the years. At some point in time, take box out, re-tighten or solder the rivet connections. Some of these have "bus-bar" connections that jumper incoming points on the fusebox. Or use external wire jumpers. Best to add external wire jumpers *everywhere* there is a bus connection with no external jumper wire to begin with. This would end up being a duplicate, parallel circuit.
- 930 A/c system gangs too many loads into too few circuits. Steve Grosskemper ( again) ....or was it John Rice..offers suggestions on how to add more fuses to separate these loads and have the wires run cooler. I think this article resides somewhere in the Pelican Tech Article section.
- no headlight relays ( as mentioned)
- other interior lights are still not fused with this mod ( cig lighter...fresh air panel).

[911pcars]

Wil,
Thanks for the summary. So correct. In regards to:

"- oddly *all* relays that Porsche uses ( ex: foglight relay) is fused only on the power side...not on the control side."

Good observation. Let me offer this. For owners using aftermarket headlight relays, check the circuit connections. While the power side of the relay (high current) is fused, the control side may not be. While current flow is very low through a relay control circuit, it's good practice to protect all electrical circuits in one way or another (fuse, fusible link, circuit breaker, etc.).

MHO,
Sherwood

[defcon65]

Thanks for the link, Wil. I've been printing out as many threads as I can find regarding the alternator, VR, wiring fixes and non-fused circuits hoping I can solve the battery/starting/charging problems I've been chasing all last year. I'm looking at a systemic approach to rectify the many and well-discussed shortcomings of the 911 electricals.

I'm going to pull, inspect and clean the alt tonight and drop it off at the local auto electric shop for testing and repair, assuming it's not a Paris/Rhone, in which case I will have to find a suitable replacement.

I'm not sure I want to replace the fuseblock as described in the article but will definitely install a few additional fuses where needed.

Should keep me busy until warm weather returns.

Thanks for the guidance!

Regards,

[Wil Ferch]

Ooops....let's not forget that the footwell blowers were not fused until 87 or so. I added identical 10A, ATO flat blade fuses for each of my footwell blowers , like the later cars.....

- Wil

[darthracing]

This company has ATC fuse blocks up to 12 at a time...might make for easier mounting.

http://www.wiringproducts.com/index1.html (evil redirection, Google "atc fuse block")

[LM3929]

Will I create any problems by installing fusable links in the the three main Red supply wires just aft of the battery?

Thanks LM