I extended my stock wiring harness today and wire by wire figured out (or more like confirmed by cutting the wires in the harness extension) function of each wire in the harness, as I had some questions I wanted confirmed before I wrap up my harness adapter.
This applies only to those with early cars and the rectangular 19 pin C101 engine harness connector.
My extension lol
Started cutting wires by at a time to confirm their function/effect
fuel pump wire
The following wires are needed to start the car.
6 - power fused
7 - fuel pump
8 - power while starting
10 - power no fused
Then the following should be connected as well
1 - D+ alternator (triggers the battery light in the cluster)
4 - controls the coolant temp gauge in the cluster
16 - oil pressure light (pretty sure this was affecting the oil light in the cluster)
The following made no difference on my car
2 - oil static
15 - oil dynamic
17 - si board
end of part 1
Part 2.
Now, on the passenger side there is also a white 3 pin connector. It's got a black, green, and yellow/white (yellow/brown) wires.
will not start
connect the green and it will start but no tach or mpg
connect the black and you'll get the tach, connect the yellow and you'll get mpg
If the green wire is not connected, car will crank but will not start.
If the green wire is the only one connected, car will start but you'll have no tach or mpg, speedo will work though
If the black wire is connected then you get tach
If the yellow/white or yellow/brown is connected then you also get MPG
Hope this helps.
This applies only to those with early cars and the rectangular 19 pin C101 engine harness connector.
My extension lol
Started cutting wires by at a time to confirm their function/effect
fuel pump wire
The following wires are needed to start the car.
6 - power fused
7 - fuel pump
8 - power while starting
10 - power no fused
Then the following should be connected as well
1 - D+ alternator (triggers the battery light in the cluster)
4 - controls the coolant temp gauge in the cluster
16 - oil pressure light (pretty sure this was affecting the oil light in the cluster)
The following made no difference on my car
2 - oil static
15 - oil dynamic
17 - si board
end of part 1
Part 2.
Now, on the passenger side there is also a white 3 pin connector. It's got a black, green, and yellow/white (yellow/brown) wires.
will not start
connect the green and it will start but no tach or mpg
connect the black and you'll get the tach, connect the yellow and you'll get mpg
If the green wire is not connected, car will crank but will not start.
If the green wire is the only one connected, car will start but you'll have no tach or mpg, speedo will work though
If the black wire is connected then you get tach
If the yellow/white or yellow/brown is connected then you also get MPG
Hope this helps.
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