05-02-2021, 05:42 AM
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#1
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Registered User
Join Date: Jul 2011
Location: Richmond, VA (The Fan)
Posts: 978
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Alternator Wiring Question
For I hope this isn't a duplicate post, I just posted it but it seems to have disappeared..maybe a hit preview. Anyways, I'm trying to finish up the wiring on my swap and having trouble with the alternator. I have the main power connected but I can't find a wiring diagram for the blue wire and the small red wire. I believe the blue wire is for the voltage gauge but no idea on the small red wire. Does anyone know where this goes? 
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1997 Boxster 4.2L Audi V8 Bi-Turbo
2003 911 C2
NASA HPDE Instructor
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05-02-2021, 12:31 PM
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#2
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Registered User
Join Date: Oct 2020
Location: KY
Posts: 1,216
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Is that coming off the hot side? I've never looked at our alternator but I've not seen a setup like that before. Thats too small of a guage to be the primary feed to the starter i would think. Maybe someone added that to an accessory? Or it may feeds directly back to the dme to monitor output. Sorry, I'm sure that's not much help but I'm interested in finding out.
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2000 Box Base, Renegade Stage 1 performance mods complete, more to come
When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...
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05-02-2021, 01:27 PM
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#3
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Registered User
Join Date: Oct 2014
Location: California Central Coast
Posts: 1,476
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Per the Bently Electrical wiring diagrams EWD-54 that red wire feeds a 40amp Maxi fuse at Relay support 2. The Maxi fuse powers the relay and SAI pump so you will just remove. The blue wire on EWD-15 is to the charge indicator (Voltage gauge) as you previously stated.
Last edited by 911monty; 05-02-2021 at 03:04 PM.
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05-02-2021, 01:40 PM
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#4
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Registered User
Join Date: May 2017
Posts: 1,182
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Interested in this as well as where the big wire on the alt goes to (ultimately the battery obviously, but does it to to the junction at the top of the engine, toward the firewall? Cable 19?
So is the small red wire going to the 40amp maxi fuse or relay support 2? 2 very different things.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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05-02-2021, 02:58 PM
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#5
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Registered User
Join Date: Oct 2014
Location: California Central Coast
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Quote:
Originally Posted by Stl-986
Interested in this as well as where the big wire on the alt goes to (ultimately the battery obviously, but does it to to the junction at the top of the engine, toward the firewall? Cable 19?
So is the small red wire going to the 40amp maxi fuse or relay support 2? 2 very different things.
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The small red wire goes to the 40amp maxi fuse. The "Case at relay support 2" is a description for location. The large wire goes to terminal 30 at the firewall, then to the current distribution panel, then to battery.
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05-02-2021, 04:37 PM
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#6
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Registered User
Join Date: Oct 2020
Location: KY
Posts: 1,216
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So it's a direct feed to the sai pump it looks like? I guess that makes sense as you would want this powering up immediately if called for.
Where did that diagram come from? I am a bit confused why it makes mention of an egr circuit.
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__________________
2000 Box Base, Renegade Stage 1 performance mods complete, more to come
When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...
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05-02-2021, 04:41 PM
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#7
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Registered User
Join Date: May 2017
Posts: 1,182
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came from the FSM
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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05-03-2021, 02:28 PM
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#8
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Registered User
Join Date: Jul 2011
Location: Richmond, VA (The Fan)
Posts: 978
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awesome thanks guys, so it sounds like I only need to connect the large cable which goes to the battery and I'm all set.
__________________
1997 Boxster 4.2L Audi V8 Bi-Turbo
2003 911 C2
NASA HPDE Instructor
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05-03-2021, 02:30 PM
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#9
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Registered User
Join Date: May 2017
Posts: 1,182
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Well, you need the small red wire connected also.
__________________
2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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05-03-2021, 02:45 PM
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#10
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Registered User
Join Date: Oct 2014
Location: California Central Coast
Posts: 1,476
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Quote:
Originally Posted by truegearhead
awesome thanks guys, so it sounds like I only need to connect the large cable which goes to the battery and I'm all set. |
Yep!
Quote:
Originally Posted by Stl-986
Well, you need the small red wire connected also.
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No his Audi powerplant is far from stock and has no need for SAI. Maybe an airplane nav light
Last edited by 911monty; 05-03-2021 at 02:48 PM.
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1998 Porsche Boxster
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