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Join Date: Jun 2013
Location: Clayton, NC
Posts: 1,036
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Alternator Wire Size and Type
I searched the forum regarding the size of the red alternator wire, and determined that the original size in the engine harness was equivalent to 8 gauge, but it was recommended to use 6 gauge. What is the recommended type of wiring (GPT, TXL, SXL,..) to use, since it has to withstand the high heat of a 911 engine bay? I’ve searched the web and can’t find any 6 Gauge SXL, and only 8 gauge GPT. Any recommendations on sources?
The car is a 1970 911T in case it matters for the wiring size. Also, where is the wire size listed in the Factory Manual? I have the original factory manual with the wiring diagrams and cant find where the metric wire sizes are listed for each circuit. Thanks! Last edited by dennisO; 04-19-2023 at 07:17 PM.. |
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04-19-2023, 07:00 PM
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ROW '78 911 Targa
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Just go to an auto parts supplier/store and buy some real red battery cable. It will be rated for what you need.
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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04-19-2023, 07:57 PM
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Alternator Wire Size and Type
Look for painless wiring brand alternator 6awg
It is a thin wall xlpe type. Stay away from PVC insulation, the vinyl insulation is crap. It burns, deforms, absorbs water and oils and it’s cheap. The XLPE types are better even when thinner than PVC SXL is the thickest cross link (XL) type Then GXL. TXL is the thinnest GPT is a PVC insulated wire for trailers and other low cost applications. Sent from my iPhone using Tapatalk Last edited by TwoBluPorsches; 04-19-2023 at 08:45 PM.. |
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04-19-2023, 08:38 PM
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Join Date: Jun 2002
Posts: 893
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Alternator
You will find it at Home Depot. That is where I got mine.
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04-19-2023, 09:07 PM
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Join Date: Jul 2021
Posts: 634
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You can get M22759/16 in a lot of sizes pretty easily. It's ETFE (Tefzel), good to 150*C. If your engine bay exceeds that, you've got bigger problems! Here it is in 6 gauge. It's thin, stiff, and a bit of a problem to work with, though. I have a preference for this battery cable. Lower temp rating at 105*C, but it's nice and bendy. Feels like welding cables instead of the Tefzel's power lines, if that makes sense.
(Most of the wire I've got in my garage comes from ProwireUSA - They've got all kinds of fun stuff. If you're ever interested in building a custom harness, this is a great site to bookmark.)
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http://forums.pelicanparts.com/porsche-911-technical-forum/1114917-jedi-911sc.html Last edited by TeeJayHoward; 04-20-2023 at 03:54 AM.. |
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04-20-2023, 03:51 AM
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Join Date: Jun 2013
Location: Clayton, NC
Posts: 1,036
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Thanks Guys.
I changed my search based on the info above found the recommended 6 AWG cable. Does the early Factory Manual provide the wire gauge information, as I can't find it? |
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04-20-2023, 04:28 AM
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Registered
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Alternator Wire Size and Type
Haynes manual diagrams for the 1974 show 10mm going to the back of the starter /battery connection and 2.5 going to engine compartment fuse
10 mm^2 = 8 AWG Bentley SC manual shows the same  Sent from my iPhone using Tapatalk |
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04-20-2023, 06:20 AM
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Heinz
