im in the middle of making my race car harness and its very bare i have done away with the fuse boxs under the dash and hood and im needing some help. Ok so there are i think 2 logic grounds and 2 power grounds i know that the power grounds would be to the chassis like all grounds but what about the logic grounds??

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what should i do with the ELD wire from the ecu does it go to the alt ?? and if i delete will the ecu get 13.5-14v and burn it up??

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what size relays and fuses would you use on my project. Im going to run relays and fuse for my ecu/fan/pump

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Why are the dizzy wire from the ecu in a funky sleeving and can i take it out of that?

Thanks guys this is my first whole car harness pics will come as soon i get more supplys and something worth takin a pic of

 

When I do a harness from scratch I ground ecu, sensors, WB, logger (anything that's important) to a bolt/boss/bracket that hangs directly off of the block or the cylinder head (usually head). I don't think of the chassis as a good 'ground' as between panels you can get offsets. I go right from the motor to battery neg and the chassis with large gauge wires as well.

I'm not up on Honda distros but if it's a shield, you need it.

 

I see problems in your future. I think you should consider buying a pre made harness. Nothing against you, but the questions you're asking are elementary and if you're unsure of those, there are probably 20 more questions that you need answers to for this project and don't even know to ask the questions. Seriously, no offense, just trying to save you some time.

Logic grounds are regulated ground supplies, all sensors should see logic grounds not chassis grounds.

 

Wiring is one of those things that's best taught by someone who already knows what their doing. Learning by trial and error can get expensive if you don't know the basics.

 

thanks for the help guy and i know my ? sound dumb but i want to make sure im doing it right. I found alot of info today but i need some info does anyone have pin outs for 92-95 civic passager shock tower plugs thats all i need to start this harness. thanks