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Wire harness

I was wondering if anyone is familiar with the wire harness for a 1972 porsche 914. I found two wires that come from the 12 point harness a black/brown and a yellow one. Where do they go? They were torn at the end.

Thanks
Old 09-16-2007, 10:34 AM
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Which harness is it, there are several in a 914?
Old 09-16-2007, 02:16 PM
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"12-point harness"--do you mean the harness that plugs into the 12-pin plug on the relay board? A yellow wire (pretty thick) from there would go to any of the flag terminals on the back of the starter--it will poke through the rear engine tin. A black/brown one doesn't ring a bell. Do you mean that it looks sort of black and sort of brown, or that it is black with a brown stripe? If the latter, could the brown stripe be a different color? Like purple? If so, it is the tach signal wire and plugs into the coi (-) terminal.

--DD
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Old 09-16-2007, 05:07 PM
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As for the black wire I looked at it and is more like black & red, the other wire is yellow but not a thick one. Actually the yellow wire comes from the conectors right next to the twelve point harness. The conector has 4 male (i think) conectors to plug 4 wire into it.

sorry about my description, that's the best i can.
Old 09-16-2007, 06:07 PM
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The 73 relay board diagram is not completely correct for your 72, but it should at least be close.

You can pop the back off of the connector to see which pin the wires go to. Be careful to not let them go everywhere, though!

Black/red would have +12V when the key is on, and provides power to the coil. It plugs into the (+) coil terminal.

Yellow into the four-pin connector sounds a lot like a 1.8, not a 72 which would be a 1.7. Has someone replaced the EFI?

--DD
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Old 09-16-2007, 10:14 PM
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I'm not really familiar with those engines. As far as I know the engine is a 1.8 since the previous owner modified it to a 1.8 from 1.7.
So where does the yellow wire from the for-pin connector would have to go. The yellow wire is connected to the pin on the bottome left as I'm looking at the car from the back.

--TS
Old 09-17-2007, 10:11 AM
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By the way the engine has dual 40 webers. I don't know if that helps. The car was driving fine and when I tried to start it again there is only one spark coming from the coil. I bought a new coil and still the same problem. Then I start looking at the wires and saw the two wires black/red and the yellow one that comes from the for-pin connector ripped (broken). I don't know what really happened. I think probably the fan tore those wires.
Old 09-17-2007, 10:21 AM
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The carb conversion really changes things up, particularly if you're talking about the four-pin connector. That's the connector for the EFI wiring harness, which (generally) is not used when you have carbs.

However, a clever person can hook up a wire or two to run the fuel pump with the stock pump relay. I believe that hooking a grounded wire up to the front-left pin in the four-pin connector will force the pump to run when the key is on--as long as the EFI "power supply relay" and the fuel pump relay is in place.

Check the yellow wire to see if it has zero resistance to ground, or if it gets +12V when the key is on, or what.

--DD
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Old 09-17-2007, 06:02 PM
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I conected it to ground and the car would not want to start.
Old 09-17-2007, 06:22 PM
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