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Battery power supply to ignition switch
Im doing my 911 68.
I have the wiring diagram in front of me. I cannot see where the ignition switch is fed from the battery. I take it has constant 12v and when the ignition is turned on a wire from it feeds to the engine. I have tracked the starter wire but not the 12 volt feed from the ignition switch to the engine bay. Car is a non runner and has been attacked by the previous owner. So I'm wanting to get it half right before I go cranking it. Thanks Lyndon |
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01-29-2020, 03:07 PM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
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Assuming it is the same as a 69 it gets the power from the fuse block. Part of the fuse block is hot from the battery.
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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01-29-2020, 04:30 PM
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Battery to fuse 3. Heater. So this goes nowhere.
Battery to starter. Then to the block in the engine bay. Then it goes to a relay fed by the starter wire on the ign switch. Alternator B+ is also from the battery. Fuel pump is fed by fuse 1. It looks like fuse 1 is fed via the ignition switch but I can't see what feeds the ign switch. I guess I will find out when I put a battery in it. Lyndon |
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01-29-2020, 04:41 PM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
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There are connections on the back of the fuse block. On the '69 fuses 1-5 are actually connected by a strip on the back of the fuse block. Could be the case with yours. Hope that helps.
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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01-29-2020, 06:22 PM
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I will have a look.
Thanks Lyndon |
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01-29-2020, 06:23 PM
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ROW '78 911 Targa
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Battery positive black wire to fuse 3 that is internally jumpered to 2 & 4. Fuse 2 red to light switch terminal 30 then goes to ignition switch terminal 30. Then switched power goes out terminal 15 back to fuse 1.
Schematic: https://www.dropbox.com/s/laojh5hm43qqtyl/65%20to%2068.jpeg?dl=0
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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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01-29-2020, 07:01 PM
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Makes it easy when you know what your looking for. Found it. I find electrical stuff a challenge.
Thanks Lyndon |
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01-29-2020, 07:08 PM
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And that feeds fuse 1 when the ign is on which feeds my fuel pump and no doubt my coil.
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01-29-2020, 07:10 PM
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Im fitting msd. So no need for the resitor via the coil. Should be able to clean up the engine bay nicely.
Last edited by Lyndon302; 01-29-2020 at 07:15 PM.. |
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01-29-2020, 07:13 PM
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ROW '78 911 Targa
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Quote:
__________________
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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01-29-2020, 08:30 PM
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Location: So. Calif.
Posts: 19,910
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If you remove fuse number 1, the ignition switch and related circuits are dead. Thus, no. 1 is the voltage source for the ignition.
This is handy to know when the car stops working in the middle of a ride. Sherwood |
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01-30-2020, 01:05 AM
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A good place for a kill switch.
Lyndon |
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01-30-2020, 04:02 AM
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My Garage
1971 Porsche 911
Baja Bug
Heinz
