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> What is this wire for?
ricardo
post Dec 2 2016, 03:54 PM
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This is a white wire with a male connector that comes out of the harness right by the #3 cylinder?Attached Image
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Krieger
post Dec 2 2016, 04:04 PM
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Cylinder head temp sensor.
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ricardo
post Dec 2 2016, 04:13 PM
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I've got the temp sensor plugged in to another connector, a green wire that comes from the harness under the battery.
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BeatNavy
post Dec 2 2016, 05:04 PM
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I think Andy is right, and if you don't have the CHT plugged into the correct wire off the harness your car won't start. It is supposed to connect to a single white wire off the harness near Cyl #3 as you describe it. Better check again.
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ricardo
post Dec 3 2016, 06:40 AM
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Where do I plug in the wire from the oil pressure sensor?
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BeatNavy
post Dec 3 2016, 07:02 AM
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Wiring diagram: http://www.pelicanparts.com/914/parts/Elec...lectric_73C.jpg

Oil pressure switch is #40 on the diagram, which connects to a green and (red?) wire. That is likely the wire to which you had the CHT connected.

As mentioned in previous thread: disconnected oil pressure switch won't keep the engine from starting. But a disconnected (or faulty) CHT will.
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ricardo
post Dec 3 2016, 07:20 AM
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Is that a wire that has a male connector with a plastic cover over the end, which is under the battery?
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TheCabinetmaker
post Dec 3 2016, 07:27 AM
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No. Print out the wiring diagram. It's all there.
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BeatNavy
post Dec 3 2016, 07:47 AM
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QUOTE(The Cabinetmaker @ Dec 3 2016, 08:27 AM) *

No. Print out the wiring diagram. It's all there.

(IMG:style_emoticons/default/agree.gif) Here's the link to all the diagram info: http://www.pelicanparts.com/914/914_electrical_diagrams.htm

You need the two 1973 wiring diagrams and their corresponding legends. A PO may have hacked the wiring at some point, but use the diagrams to understand what it's supposed to look like.
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ricardo
post Dec 3 2016, 08:21 AM
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OK, so the legend shows the pressure sender wire going to #90 - Regulator Plate
What is a regulator plate and does this diagram apply to my 1974 1.8?
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BeatNavy
post Dec 3 2016, 08:32 AM
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I believe the regulator plate is more commonly known around here as the relay board. It's got the relays, fuses, and several multi-wire connectors on it on the driver's side of the engine bay. Yes, you do have one (or you better have one).

Edit: yes, this diagram applies to your 1974 1.8. If you're looking specifically at FI wiring connections, notice there's a separate wiring diagram for L-Jet and D-Jet on that page. But for the components you're looking at (oil pressure switch, CHT, etc.), that diagram applies.
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ricardo
post Dec 3 2016, 08:37 AM
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So, I believe, the wire under the battery goes into the wiring harness which goes to the relay board.
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iankarr
post Dec 3 2016, 09:02 AM
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The green wire which is in the same harness as the white one (and should have a female spade connector) goes to the oil pressure switch which sticks up out of the tin next to the distributor on the passenger side. The wire under the battery sounds like the oil temp sender connection to the console wiring harness... but if you post a pic we can confirm.
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ricardo
post Dec 3 2016, 10:46 AM
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Thanks guys, switched the wire for the oil pressure sender and it fired up!
This is a great day after all the weeks of troubleshooting.
And, It happened on my Birthday!
I've included a picture of the wire under the batteryAttached Image (IMG:style_emoticons/default/piratenanner.gif)
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BeatNavy
post Dec 3 2016, 11:02 AM
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Good for you. I know you've been working on this for a couple of weeks, and that's always a winner when it finally fires up (IMG:style_emoticons/default/beerchug.gif) And Happy Birthday.
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SirAndy
post Dec 3 2016, 01:09 PM
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The green wire under the battery tray should have a black stripe on it.

If so, it goes to the oil TEMP sender.
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iankarr
post Dec 3 2016, 05:30 PM
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Congrats, Ricardo! Enjoy these victories...and your birthday!
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Krieger
post Dec 3 2016, 11:52 PM
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Nice work! (IMG:style_emoticons/default/beerchug.gif)
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