on all 84 - 87 cars, C104 lives right next to the ECU, its a 3 pin connector that plugs in right next to the ECU harness (you can see it coming out of it)
On this connector, it provides Coil Power, MPG Gauge, and Tachometer Information for the car.
On 88 - 91 E30's, C104 was integrated into the C101 harness, so it no longer exists.
If you look at my adapter I made, you can see the C104 3 pin connector coming out the side. That was to plug in to the factory connector under the dash on the 84 325e. Now as you are installing it on an early chassis using a late model wiring harness (I presume 88+) The Green power wire on the 325e 84 side that lives on C104 will no longer be used.
Please look at these PDF files to help you shed some light on the wiring.
Here is an 85 diagram, which is pretty much the same as the 84 for 6 cylinders.
Here is an 89 wiring diagram for all 88+ harness's
Keep in mind these are for the entire car, and you will need to run through the pages to each section (Injection Electronics, Check Engine Light, Instrumentation etc) to get all the pin colors. I have a full diagram in my shop but I won't be on that computer for awhile. If you carefully read through each PDF it will take you about an hour or two to decipher everything.
I recommend having the junkyard connectors in front of you so you can confirm wire color. The diagrams are pretty easy to read so you should not have any issues.
Anything else let me know =) Have fun!
On this connector, it provides Coil Power, MPG Gauge, and Tachometer Information for the car.
On 88 - 91 E30's, C104 was integrated into the C101 harness, so it no longer exists.
If you look at my adapter I made, you can see the C104 3 pin connector coming out the side. That was to plug in to the factory connector under the dash on the 84 325e. Now as you are installing it on an early chassis using a late model wiring harness (I presume 88+) The Green power wire on the 325e 84 side that lives on C104 will no longer be used.
Please look at these PDF files to help you shed some light on the wiring.
Here is an 85 diagram, which is pretty much the same as the 84 for 6 cylinders.
Here is an 89 wiring diagram for all 88+ harness's
Keep in mind these are for the entire car, and you will need to run through the pages to each section (Injection Electronics, Check Engine Light, Instrumentation etc) to get all the pin colors. I have a full diagram in my shop but I won't be on that computer for awhile. If you carefully read through each PDF it will take you about an hour or two to decipher everything.
I recommend having the junkyard connectors in front of you so you can confirm wire color. The diagrams are pretty easy to read so you should not have any issues.
Anything else let me know =) Have fun!
It's the 'stache, Luke.
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