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George B.
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52 Posts
Discussion Starter #1
I was positive I'd remember what every connector on the engine harness was on my 2005 Elise, but I was wrong :surprise:

It's a square plug with 4 pins, but only one has a wire on it. If anyone can tell me what it's for I'd be thrilled to know. It comes out of the cable like it was to be connected on the front of the engine, this is the only one that doesn't have a home.

Thanks in advance,

George
 

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587 Posts
I am guessing here so bare with me, could it be the a/c compressor, if not that maybe the knock sensor plug. ?
 

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George B.
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52 Posts
Discussion Starter #3
I am guessing here so bare with me, could it be the a/c compressor, if not that maybe the knock sensor plug. ?
Thanks for your interest GRG53!

The knock sensor is a two wire connection
The AC connector is also two wire
The Alternator is 3 wire

All of the above are connected.

This is a 4 pin connector shell, with one wire, and the other 3 pins have a rubber seal where the wire would go through to indicate it's intentional and to keep the innards clean i'd imagine.
 

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Color or colors of the single wire? Are the pictures looking up with the diffuser/pan removed or looking down?
 

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George B.
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52 Posts
Discussion Starter #5 (Edited)
I am guessing here so bare with me, could it be the a/c compressor, if not that maybe the knock sensor plug. ?
Color or colors of the single wire? Are the pictures looking up with the diffuser/pan removed or looking down?
A single RED wire with a white tracer. The picture is taken looking down in front of the engine, BOE hinge installed, clam tilted up. 4 pin shell, and one wire, the other three holes have factory supplied plugs in the holes where the wires would be routed if used.
 

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George B.
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52 Posts
Discussion Starter #6
A single RED wire with a white tracer. The picture is taken looking down in front of the engine, BOE hinge installed, clam tilted up. 4 pin shell, and one wire, the other three holes have factory supplied plugs in the holes where the wires would be routed if used.
Looking at the harness, this (Red lead with white tracer) comes out of the harness with several other leads, one being the sensor just above the oil filter.
 

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George B.
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52 Posts
Discussion Starter #7
Here's a better orientation, the picture was taken from the passenger side of the car looking down on the radiator hose connected to the thermostat housing. in this picture you can see the rubber plugs in the other three holes in the connector shell.
 

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George, I have an early 2005 Federal Elise with the clam open and lower pan removed. I just took a look and I didn't see a connector like this anywhere on my car, but I have deleted the A/C from my car. I looked through the wiring diagrams (05MY) and I only saw one RW wire (red with white stripe) on the car (sheet 8) for instrument panel illumination. The diagram does show A/C compressor to have a single RS wire (Red with Slate stripe) on sheet 10. The only other thing that might remotely be in the area is an RK wire (red with pink stripe) for the boot switch for the alarm (sheet 4). I'll attempt to attach the diagrams below in case you don't have them.
 

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George B.
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52 Posts
Discussion Starter #9
Thanks Jetblast

George, I have an early 2005 Federal Elise with the clam open and lower pan removed. I just took a look and I didn't see a connector like this anywhere on my car, but I have deleted the A/C from my car. I looked through the wiring diagrams (05MY) and I only saw one RW wire (red with white stripe) on the car (sheet 8) for instrument panel illumination. The diagram does show A/C compressor to have a single RS wire (Red with Slate stripe) on sheet 10. The only other thing that might remotely be in the area is an RK wire (red with pink stripe) for the boot switch for the alarm (sheet 4). I'll attempt to attach the diagrams below in case you don't have them.
Jetblast, thank you for your help, I didn't want to put the supercharger back on and then find out this connector had a home I couldn't reach. It's a rather unique use of a four pin connector. This AM I have natural light to look at that tracer again and verify it's white. I think it's now a safe bet I can live with it unplugged for the moment. Thank you for the drawings, they are now part of my reference.
 

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George B.
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52 Posts
Discussion Starter #11
I took a look at a 2006. It does plug into the AC compressor.
Also found a picture of a compressor to verify.
Excellent!

Following is how I deceived myself!

Looking down I saw the two pin connector firmly seated into the AC Compressor, I did not run my fingers along the lead to discover that it is an adapter! Sure enough, well out of sight and only found by probing fingers is the other end of the adapter, the mate for that square 4 pin plug!

Thanks to all for your help, I guess this means I should be glad I'm not paid to be a mechanic.

George
 
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