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Registered
Join Date: Oct 2007
Posts: 11
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Summoning Wire Detectives
Finishing a 2.7L to 3.0L (1981) swap: 1976 chassis.
Can anyone help me figure out where these two wires go? See the one marked with tape and the one below that is that looks the same? (Sorry picture came out funny. Turn head 90 degrees counter clockwise).  I think the top one is fuel safety switch and I need to jumper it somewhere. How about the two wires here that come from the DME/ECU brain that go to the back?  Brown I just need to ground somewhere. And the red/black I can jumper to the top of the rear fuses, right? |
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03-08-2014, 09:50 AM
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Fleabit peanut monkey
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Hi Eric!
Welcome. The second set of wires relates to the diagnostic port for the frequency valve. The stock colors are green/white, red and brown. The wire that looks blue or black leads to the ECU, right? That would be your green/white wire in theory. The brown is grounded and the red is your power and ties into the rear heater ventilator fuse, so I believe you are right. Go to the 1982 Electrical diagrams here and open Part 6 Page 2. You will find it here (the test port wiring) The red wire has a cross reference to Part 1 Page 2. This is actually Factory diagram Page 1 line 21. See the reference numbers at the bottom of the diagrams. Pelican Parts - Porsche 911 Parts Listings & Diagrams
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1981 911SC Targa |
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03-08-2014, 11:16 AM
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ROW '78 911 Targa
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The connector marked with blue tape is the Fuel safety switch connector (Should be a brown wire with black spots on it) and needs to connect to a wire in the male white "T" connector of the '81 harness, near the 6 pin CDI connector, that has a red and a brown/red wire in it. You need to connect it to the brown/red wire.
You also need to move the purple/black tach signal wire from the body side of the female "T" connector near the old CDI to the male 14 pin connector. It needs to go to Terminal number 12. I would insert the safety switch wire in the body side T connector spot where you removed the tach wire and then solder the tach wire into position 12 of the male 14 pin connector(at the fuse panel) then that portion of the conversion will be plug and play... I think Bob has set you straight on the other connections.  HTH...
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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. Last edited by timmy2; 03-08-2014 at 01:04 PM.. |
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03-08-2014, 12:50 PM
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ROW '78 911 Targa
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PM me your email address and I can send you the '76 wiring diagrams if you need them.
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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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03-08-2014, 01:02 PM
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1981 Porsche 911 SC Targa
Heinz
