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Join Date: Aug 2003
Location: Denver
Posts: 1,242
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Engine Electrical Question
Can you identify these wires? I purchase the car with the engine in boxes and am now installing the engine. I have this pair of wires that have been cut and capped off and I'm not sure if they are important or not. Supposedly the car ran before disassembly. The wires are brown and gray. They appear to be tied in with the ignition wiring harness but it's hard to tell in my garage at night in 18 degree weather. Can anyone identify?
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1999 996 C4 Cabriolet 1997 BMW M3 (Hail) 1985 928 S (Sold) 1982 SC Targa (Sold) |
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02-09-2004, 05:57 PM
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Heck, I’m only 5 not 71!
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It is hard to see the capped wires but one thing I notice is that you don't have an external voltage regulator mounted on the electrical panel. Do you have the updated alternator with the built in voltage regulator?
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Pat Henry Targa80 1980SC Targa (Mocha Brown) |
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02-09-2004, 06:40 PM
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Heck, I’m only 5 not 71!
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Here is a photo of my engine bay wiring It has not been modified so it might help you in figuring out what is missing.
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Pat Henry Targa80 1980SC Targa (Mocha Brown) |
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02-09-2004, 06:59 PM
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Information Overloader
Join Date: Mar 2003
Location: NW Lower Michigan
Posts: 29,334
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Pat:
I'm looking at your pic and have a question. What are the wires near the center of the bottom of the pic? They are connected by a cylindrical connector with one ground (brown) going to the console with a red to the left and a green to the front of the engine bay. My connector is not connected to anything. It's a three prong palstic cylinder just hanging. Any ideas? |
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02-10-2004, 03:43 AM
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Senior Member
Join Date: Feb 2000
Location: Lacey, WA. USA
Posts: 25,305
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Jim, that's a test plug. You can use it to test the oxygen sensor duty cycle. You'd hook a dwell meter up between the brown wire (ground) and one of the others. Green, I think. Anyway, with the dwell meter set to the "4-cylinder" option, the dwell should oscillate between about 40 and 50, centering on 45. that would mean your O2 sensor is working, and it thinks your mixture is correct. A higher reading suggests a lean mixture. Lower means a rich mixture.
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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02-10-2004, 05:41 AM
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Information Overloader
Join Date: Mar 2003
Location: NW Lower Michigan
Posts: 29,334
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Sup:
So it's not a delayed detonation device waiting to go off if left unplugged? I can relax. I'm about to reinstall my engine and could find no male for the female connector. I'll rest easier now, Thanks. |
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02-10-2004, 05:47 AM
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Heck, I’m only 5 not 71!
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Jimcry:
Superman is correct it is the O2 test connector. I traced those wires back to the lambda control box and hooked up a dwell meter in hte car that way I was able to monitor the reading under all conditions. I also had plenty of lead so I could move the dwell so I could see it and make adjustments to the mixture.
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Pat Henry Targa80 1980SC Targa (Mocha Brown) |
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02-10-2004, 07:10 AM
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Location: Denver
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"Do you have the updated alternator with the built in voltage regulator?" per Pat.
I'm not sure. How would I know? Sorry, when it comes to the electrical stuff, I'm not very knowledgeable. What should I look for on the alternator to know if I have a built in voltage regulator? I'm hoping you are correct and this these wires are fine being capped off.
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1999 996 C4 Cabriolet 1997 BMW M3 (Hail) 1985 928 S (Sold) 1982 SC Targa (Sold) |
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02-10-2004, 09:47 AM
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Heck, I’m only 5 not 71!
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In the picture I posted there is a white box with a yellow rectagle on it that is the external voltage regulator located in its normal mounting position. In the picture you posted there is no voltage regulator mounted. That is why I asked if you had the internal type alternator.
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Pat Henry Targa80 1980SC Targa (Mocha Brown) |
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02-10-2004, 09:10 PM
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isnt the three pronged female plug the one that goes into the external regulator?
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02-10-2004, 09:14 PM
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here is a pic of my 75. as original
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02-10-2004, 09:15 PM
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you see the three prong thing in the highlight? is that what you have?
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02-10-2004, 09:16 PM
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you see the three prong thing in the highlight? is that what you have? mine goes to a suppressor and then goes to the external VR. hope i helped. let me know if you need more pics.
cliff
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02-10-2004, 09:16 PM
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I assume I must. I'll look at it and see if I see something that resembles that box.
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1999 996 C4 Cabriolet 1997 BMW M3 (Hail) 1985 928 S (Sold) 1982 SC Targa (Sold) |
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02-11-2004, 06:15 AM
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