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Wiring deep dive...

 
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mvde27  



Joined: 14 Jan 2024
Posts: 35
Location: Macungie, PA

PostPosted: Fri Aug 09, 2024 1:38 am    Post subject: Wiring deep dive... Reply with quote

Tackling the wiring mess in my 82 931.

First step was identification.
There are lots of cut wires right off the bat. Clearly cut wires that dont look like damage but clipped.

It is as easy a reconnecting those wires that have been separated?
Can't be that simple can it? at least as a start.

Thank you in advance.
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Fifty50Plus  



Joined: 28 Feb 2008
Posts: 1399
Location: Washington DC area

PostPosted: Fri Aug 09, 2024 6:06 am    Post subject: Reply with quote

If you are trying to get it going for the first time, re-splicing the cut wires is a way to do it. If all the wire jacket colors match, get some crimps and splices from your local auto parts store to do the work.
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1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car
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mvde27  



Joined: 14 Jan 2024
Posts: 35
Location: Macungie, PA

PostPosted: Fri Aug 09, 2024 6:15 am    Post subject: Reply with quote

The car runs and drives currently.

Thought I would clean up the mess.
Started when the rear wiper went out.
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924RACR  



Joined: 29 Jul 2001
Posts: 8880
Location: Royal Oak, MI, USA

PostPosted: Fri Aug 09, 2024 10:51 pm    Post subject: Reply with quote

I'd recommend against using the ones at the local auto parts store - cheap junk from China, but even worse they aren't usually heat shrink, which is mandatory IMO.

Here's a good source for quality, reasonably-priced ones...
https://www.mcmaster.com/products/electrical-connectors/wire-splices-1~/

I just use the crimp style, but there's also a style that are loaded with solder that'll flow when you heat them for the heat shrink, if you prefer that type.

Also worth getting a higher-quality crimping tool; the typical multi-tool sort don't usually provide a good crimp in my experience, just makes for weird problems later on...

These are the ones I was gifted, some time ago, and they've held up with great strong crimps for many years...
https://shop.channellock.com/products/909

Oh, and also yes definitely worth getting a proper heat gun for the heat shrinks, instead of cheaping out and using a lighter. Plenty of good, inexpensive ones on Amazon or Harbor Freight etc - don't need to get too fancy with this tool, IMO...
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Fifty50Plus  



Joined: 28 Feb 2008
Posts: 1399
Location: Washington DC area

PostPosted: Sat Aug 10, 2024 9:27 am    Post subject: Reply with quote

If you want it permanent, do what Vaughan says.
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1979 924 NA race car
1982 924 NA race car - Sold
1982 924 Turbo almost a PoS
1981 924 Turbo a real PoS, new engine
1982 924 Turbo nice body, blown engine
1972 911 E race car - going to Vintage
Various 944s to become IT-S race car
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Beartooth  



Joined: 05 Apr 2022
Posts: 256
Location: Roberts, MT

PostPosted: Wed Aug 14, 2024 3:37 am    Post subject: Reply with quote

I'll echo the "do it right, and don't use Wal-Mart grade connectors and terminators" comments. The best way to do it is solder and heat-shrink tubing, but quality connectors with heat shrink are a good way to go. Trying to solder wires under the dash is probably more trouble than it's worth. I bought a nice crimping tool (https://www.summitracing.com/parts/sng-18980), but the Channellock tool would probably work just as well for this. I do a variety of other wiring projects, so having a tool that can do most anything helps; I'm going to start using weatherpak or Deutsch connectors where appropriate, and maybe building my own wiring harnesses some day. That said, if you're mostly troubleshooting and think you might have to undo and redo connections until you get it sorted, it wouldn't hurt to use cheap stuff and replace it with something better once you've got it figured out. Probably the most important thing - especially if you live in a humid climate - is having crimp connectors sealed. It's less critical with soldered connections, but could cause issues eventually there too. One thing I'd recommend is something better than the most basic heat gun. I found this one about a year ago:
https://www.summitracing.com/parts/por-pc1500hg. It's so much nicer than the one I had before that crapped out; it's got adjustable heat in addition to two fan settings, not just high and low - it's a lot more tool for not much more money.
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Last edited by Beartooth on Wed Aug 14, 2024 3:38 pm; edited 1 time in total
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mvde27  



Joined: 14 Jan 2024
Posts: 35
Location: Macungie, PA

PostPosted: Wed Aug 14, 2024 3:52 am    Post subject: Reply with quote

Thank you for the advice.

Passing on the 931 and want it to be as correct as I can for a new owner.
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