Wiring harness differences for eta?

[328ijunkie]

The last one mentioned is a Vehicle speed signal to the ECU...

[BusyMrE30]

pin 24 on the e36 goes to the red/yellow wire of the c104
pin 14 on the e36 goes to the black wire of the c104
pin 20 of the e36 goes to the wire on the back of the instrument cluster in the circuit board with the green covering that snaps onto the cluster.

these three wires the last one [in 20 wich wire do i splic it in to on the back of the cluster i have the rpm byt didnt know i had to put one in the back of the cluster any help here

[dnick]

well i have power now to the 3 relays. Yes i had a power wire connected wrong :|


but im still not getting spark. Oh and I checked and i have confirmed power to the fuel pump relay.

[Jand3rson]

Holy back from the dead thread. I started this almost 4 years ago when I was first going to do a 24V swap and had to abandon it.

[lolcantturn]

You using an E30 sensor?

Nope, E36 one. Am i supposed to use an E30 one?


EDIT: Yep I am, just googled it. weird.

[328ijunkie]

My coolant gauge gets power but it doesn't build up, I'm using an eta C101 to an E36 M50 one. Is this a fault of the ETA's C101 or simply a wiring fault of mine?

You using an E30 sensor?

[EtaSport]

The tach wire is in the c104 which is a 3 pin connector in the glovebox area. I am pretty sure all etas have one. In which case you shouldn't need any length of wire at all just splice it in.

If you have an econo gauge or an obc then you will want to hook up the fuel rate wire. It will not be accurate but your gauge will work. (my s50 gets like 57mpg hwy!!)

[lolcantturn]

So I splice it at the ECU and run a long ass wire to the C101?
Fuel rate is correlated to the econometer right? What exactly does it do?

[EtaSport]

My coolant gauge gets power but it doesn't build up, I'm using an eta C101 to an E36 M50 one. Is this a fault of the ETA's C101 or simply a wiring fault of mine?

Sounds like its probably a bad sensor. I had this same problem on a 2.7i I just hooked up and it turned out to be the sensor.

As for the c104, the only wire your probably gonna be concerned with is the black wire. It is easy enough to splice it directly at the dme connector harness. It's the only black wire on that harness. The black white wire will give you your fuel rate..

[lolcantturn]

My coolant gauge gets power but it doesn't build up, I'm using an eta C101 to an E36 M50 one. Is this a fault of the ETA's C101 or simply a wiring fault of mine?

[EtaSport]

You need to check power to the main relay. It should have constant power from the battery (solid red) and it needs to power up the red/white wire with key on. If you don't have power on your red/white wires then lots of things won't work. Also check switched power at the fuel pump relay. It sounds to me like you missed a power wire at the battery connection.

[dnick]

sorry to bring this back... but im working with the exact same thing that janderson is working with...My harness connector is wired right (PO did the adapter, but i think he had an "i"), but im not really sure what to do with the c101? ive got power to the starter, and to all the interior functions.. but i dont have fuel or spark! I really dont care about the obc functions and shit, i just want my tach to work, and lol my engine to start!! can anyone help?

EDIT: i mean the c104? i guess i have to open the adapter back up? and get those wires out?

[lifeiskaos]

if you want my pin charts for the eta/m50 i think i still have them sitting around. If you want to retain all of your obc functions including the code imobilization function you'll have to get further into that with the c104. The only wire you really need is the black wire for tach. There should be another one there for fuel rate, but i would have to double check if its wired there or in my c101.

looks like it

[Kerrath]

Those two wires keep the OBC function? Or is there more to it?

[Beej '86 325es]

cool thanks! Looks like it should be this wire: