5spd GT

I am putting the engine back together and have a black ground wire hanging from the EFI harness (below the salt and pepper shakers) that I am not sure where it originally bolted up to?

1993 5.0.

Thanks in advance.

projectresto83

The back of the head...its the HEGO ground.. (o2 sensors)

5spd GT

So there are two ground wires that go to the back of the head? I already have the one bolted up from the firewall to the back of the driver side head.

motorman524

Bolts to the passenger side head like said above.

5spd GT

No one mentioned it going to the passenger side head. If that is the case, it has not been ever been bolted to the back of the passenger cylinder head for as long as I have owned it and worked on it (7 years and 50k).

Can I get a confirmation on this? Since I only had one bolt on the back of my driver side head (since I can remember), I will bolt it to the driver side head as well, with the other one that goes to the firewall. This will put two grounds on that one cylinder head.

projectresto83

It just needs to bolt to the block somewhere...the head doesn't matter.

Grounds are grounds...so long as the places they are bolted to are clean and that they are in the loop.....battery>chassis and motor>chasis..

The 2 main grounds...chassis to motor and the motor to battery.... are the biggest grounds. If you had the time and it was possible for you I would locate all the little grounds to one spot or at least consolidate a few.

5spd GT

I am going to bolt that black line that has been hanging loose with the other ground on the driver side head (head to firewall). There will be two on that one bolt location.

Thanks for the helps guys.