Rebuilding an Engine Harness?

[97gst_spyder]

So, I was going to use an MS standalone ecu setup for my car. So, I removed the engine harness from my 97 gst. I took all the connectors off the harness I was going to need, with a good amount of wire left on the connector. Well I'm ending up with an Evo 8 Ecu and a destroyed harness. Yes I'm an idiot, we all know this at this point.

So, I have all the connectors, wire and wire diagrams. But, I have a few questions.

1. Do all the connectors need to interconnect to others? (power and ground)

2. How are the grounds in the factory harness setup?

3. Any help is epically awesome!

Thanks!!

 

[mike96]

So, I was going to use an MS standalone ecu setup for my car. So, I removed the engine harness from my 97 gst. I took all the connectors off the harness I was going to need, with a good amount of wire left on the connector. Well I'm ending up with an Evo 8 Ecu and a destroyed harness. Yes I'm an idiot, we all know this at this point.

So, I have all the connectors, wire and wire diagrams. But, I have a few questions.

1. Do all the connectors need to interconnect to others? (power and ground)

2. How are the grounds in the factory harness setup?

3. Any help is epically awesome!

Thanks!!

what happened to the rest of the harness??? as far as your questions go...

1. yes, kind of... it is a lot easier and probably cheaper for the factory to do it that way. if you look at the wiring diagram there are only a limited number of grounds and power coming from the ECU. example there is only one 5v output on the ecu and like 3 - 4 sensors that need 5v power. the factory could have ran an individual wire from that pin at the ecu to each sensor but that would require a lot of wire and would make the harness unnecessarily large. much easier to splice into the wire somewhere along its path and run it to the sensor that needs it.

2. as far as i can remember there are the two ground pins at the ecu for the ECU to ground and one or two for sensor grounds. other than that i think all the other grounds from the engine harness ground to the chassis in the center console right behind the ecu. follow the ecu diagram and you should be fine. i think the sensors that ground trough ECU at the sensor grounds need to be grounded that way in order for them to work correctly

 

[knochgoon24]

You may just want to buy a new/used harness from a part out and go from there. You could probably sell the plugs from your old harness to people who have broken them and make back a good bit of the difference.