Ford Coyote Ground Wire

[legend42]

This grounding wire is from the Coyote Gen 3 wiring harness. Do not see anything in the manuals about where is the best/needs to be attached.

Thanks.
128546

[edwardb]

For the ground wire, on both of my Coyote builds, including the Coupe with the Gen 3, I did take the Ford provided ground cable back to the battery. Both had front mounted batteries. So have a short #2 cable from the battery to a bolted position on the frame. Then put the Coyote ground wire under this same bolt. So it's attached to the frame as well as the battery cable. Personally, I think it would be completely acceptable with the welded steel frames our cars have to ground to the frame nearer the PDB and not go all the way back to the battery. But Ford makes a big deal about it in the instructions, and didn't want to have to try to explain not following the directions if there were any problems. You can see the Coyote ground wire coming off the main battery ground connection in this picture if you look closely.

https://hosting.photobucket.com/images/ab234/edwardb123/IMG_4036.JPG?width=590&height=370&fit=bounds (https://app.photobucket.com/u/edwardb123/p/425330a4-ed5d-4b43-b97d-d5c20dc6fd1b)

[legend42]

For the ground wire, on both of my Coyote builds, including the Coupe with the Gen 3, I did take the Ford provided ground cable back to the battery. Both had front mounted batteries. So have a short #2 cable from the battery to a bolted position on the frame. Then put the Coyote ground wire under this same bolt. So it's attached to the frame as well as the battery cable. Personally, I think it would be completely acceptable with the welded steel frames our cars have to ground to the frame nearer the PDB and not go all the way back to the battery. But Ford makes a big deal about it in the instructions, and didn't want to have to try to explain not following the directions if there were any problems. You can see the Coyote ground wire coming off the main battery ground connection in this picture if you look closely.

https://hosting.photobucket.com/images/ab234/edwardb123/IMG_4036.JPG?width=590&height=370&fit=bounds (https://app.photobucket.com/u/edwardb123/p/425330a4-ed5d-4b43-b97d-d5c20dc6fd1b)

I also have the battery forward and have it grounded to the chassis. I will ground to the neg side of the battery.

Thanks.

[BradCraig]

I grounded near the ECU on a convenient frame location, shouldn't be an issue. If it is i'll run it forward! Either way, make sure to grind the powdercoating off the frame location.

[legend42]

I grounded near the ECU on a convenient frame location, shouldn't be an issue. If it is i'll run it forward! Either way, make sure to grind the powdercoating off the frame location.

Thank you!

[Mark Reynolds]

Copper is a much better electrical conductor than steel so having a direct connection can't hurt.

[BradCraig]

Copper is a much better electrical conductor than steel so having a direct connection can't hurt.

Good point

[BradCraig]

FWIW, the Gen3 Control Pack instructions state to ground to frame or engine block. So, as discussed, either way should be good.

[toadster]

FWIW, the Gen3 Control Pack instructions state to ground to frame or engine block. So, as discussed, either way should be good.

in the latest control pack instructions, it says the blunt lead should go to the battery

Install and tighten the Negative Battery Terminal (not included in kit) onto the Vehicle Battery. Attach the ground blunt
lead to the Negative Battery Terminal (you will need to provide the eyelet). Verify that you have a good reliable (dry and
clean) ground path from the battery negative post to the chassis ground. In general, the resistance from the battery
ground to this chassis location should be less than 0.1 ohm.