hi guys,
i am replacing the wires in my engine harness and i am stuck at the grounding wires .
there are two grounding points one on the rear housing and one on the UIM.
mazda s wiring it is a bit complicated and i am wondering if i can simplify it a bit.i do not want to run three small wires inside the harness if i could run one heavy gouge wire.
i am posting the two diagrams if someone can help me with that.
also i wonder if the ecu ground internaly because those ground wires go upon the engine.
is it advisable to add a third ground point near the ecu ?that would help to ground the datalogit , wideband, and ecu together.if the ecu is grounded on its shell can i bolt the datalogits and widebands grounds on the ecu mounting bolts?

is there any reason that mazda made this wiring? parhaps to avoid any noice?

thanks!!

 

I would NOT remove any grounds from the wiring harness.

The multiple grounds are for less noise.

I added an additional ground wire in the following locations:

1) from the rat's nest bolt to chassis;
2) UIM/engine hangar to chassis;
3) battery negative to chassis;
4) tranny to chassis (like my mercedes);
5) ECU to chassis

I've NEVER had any upper RPM breakdowns . . .

Since you have an Innovate LC-1, hopefully you read this:

http://www.innovatemotorsports.com/r...-grounding.php

:-) neil

 

hi,
i do not want to remove any grounds. i want to replace the three small wires that runs inside the harnes with one large gauge wire.
will i still have noise?

 

Keep the current wires "as is" and add to it the Hyper Ground kit per Damian Dela Huerta's instructions:



You'll have a rock solid setup. I did this and it dropped my AMPs at idle from 55 to 21. Don't mess with the Mazda stock grounds, just add extras to it.

 

thanks!!!