Quote:
Originally Posted by montauk
If you're picking up a new ECU, you can usually opt for a flying lead harness instead of building one from scratch. The ECU-side wires come pre-terminated with connectors, which is what I went with for my Haltech R3. I considered using a bulkhead connector to route everything into the engine bay, but ended up feeding the harness through the same spot where the old O2 sensor bundle used to run. After watching a bunch of Haltech wiring videos, I noticed most builds passed the harness straight through the bulkhead—so I followed suit. I got the harness installed with the engine and transmission out of the car. It would have been a struggle otherwise.
The only wires I had to extend were for the ignition and injectors on the driver's side. Not a big deal.
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I did do that with my Megasquirt, but can we all agree how sweet it would be not to have to run the wires all the way through, have very short wires and if you needed to remove the engine, you could just unplug from the ECU.
My other issue is I have a Targa and they have a habit of leaking and I worry a little about the ECU under the front seat getting wet.