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Join Date: Oct 2005
Location: Martinez, CA
Posts: 356
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good spot to pull 12 volts?
Hi folks, I need to find a good place to pull a 12 volt feed from, I don't need lots of current but I want to avoid hack job wiring that looks nasty and might give me corrosion problems etc.
I have highlighted the general area I need to voltage feed from, I only need it when the ignition/engine is on, am I better off running a wire over to the left hand side to the fuse panel? Thanks!  
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1997 Boxster SOLD 1999 R1100S SOLD 1988 Carrera 3.2 |
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11-23-2008, 11:31 AM
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12 Volts
I am not aware of any switchable(hot only when ignition is "ON") 12 Volt source in the engine compartment. I have looked at all the electrical schematics in the Bentley Manual. There are three live (hot all the time) 12V sources on the left side fuse panel. You can tap into the 12V from the accessory heater fan but this ia only hot when the heater is turned on. If anyone out there know of any switchable 12V source in the engine bay let me know, I need one.
Thanks Mark
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1987 Carrera MoTec 3.8L Transplant, 993TT Brakes 2006 M3 Competition Package 2007 997 GT3 - SOLD |
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11-23-2008, 01:16 PM
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Location: Martinez, CA
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I think I will use one of the three hot supplies on the left and then use a solid state switch when the ignition is on (I have a low volt supply when the ign is on).
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1997 Boxster SOLD 1999 R1100S SOLD 1988 Carrera 3.2 |
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11-23-2008, 04:04 PM
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
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What are your up to, adding an electric supper charger?
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11-23-2008, 06:48 PM
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Detached Member
Join Date: May 2003
Location: southern California
Posts: 26,964
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Yeah, a supper charger, that's the ticket. I've heard of people with "conventional" engines poaching a fish wrapped in aluminum foil on the exhaust manifold. Is that Dinner, or Supper, I'm not sure...
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Hugh |
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11-23-2008, 06:53 PM
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Join Date: May 2001
Location: Peoples Republic of Long Beach, NY
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I tapped into the starter lug to feed the new panel.
 
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Ronin LB '77 911s 2.7 PMO E 8.5 SSI Monty MSD JPI w x6 |
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11-23-2008, 07:04 PM
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Registered
Join Date: Oct 2005
Location: Martinez, CA
Posts: 356
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Quote:
Not quite, but I'm guessing folks on this forum will find it interesting, when I'm ready I will post details/pics etc, probably in Jan. Watch this space...
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1997 Boxster SOLD 1999 R1100S SOLD 1988 Carrera 3.2 |
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12-01-2008, 09:32 AM
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AutoBahned
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or you could use a regular mech. relay - a stock round one for example.
so... is it time for our first hint yet? - how many amps will it pull?? |
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12-01-2008, 11:10 AM
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The coil and the O2 sensor both have switched +12 volts in the engine compartment. It comes off the second stage of the DME relay and it hot during cranking and during the engine running.
Also the fuel pump but that is under the car. If it was me I would tap into the O2-sensor harness since the voltage from the coil will have more high-frequency distortion. Ingo
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430 I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!! How about a NoBadDays DualChip for 964 or '95 993 |
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12-01-2008, 11:21 AM
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Memory of my college days at CSUF
1974 Porsche 911 Targa 3.6
