Electrical eec RELAY ground wire location

HemiRick · Dec 11, 2020

Where is the critical wire that provides ground to the eec relay.....where does it actually ground to the car?....89 LX 5.0 I got my car back together and have no power to fuel pump. I think during the wiring tuck I missed something.

Blown88GT · Dec 11, 2020

EEC Relay doesn't have a ground pin.
Chassis is ground.

HemiRick · Dec 11, 2020

Look at this diagram. https://www.allfordmustangs.com/thr...eec-question.278020/#lg=thread-278020&slide=0
The EEC relay has a pin that goes directly to grd.....Where does it actually connect to the body?

General karthief · Dec 11, 2020

Look around near the computer, it should be a green screw I think, I remember one between the computer and the door jamb or maybe down below the computer a little. Not sure if that is the one, I just remember one there.

evintho · Dec 11, 2020

That diagram is somewhat misleading. I have my entire control harness removed from the car right now so everything is visible. The ECU relay ground wire is the blk/wht wire that runs to the funky looking connector that ties into the negative battery cable. It integrates with other ground wires along the path all leading to the funky connector.

General karthief said:
Look around near the computer, it should be a green screw I think, I remember one between the computer and the door jamb or maybe down below the computer a little. Not sure if that is the one, I just remember one there.

That particular wire connecting to the green screw is circuit #57, the main ECU ground.

HemiRick · Dec 11, 2020

I thought pins 37 and 57 were the ECU power pins.....40 and 60 are grd pins.
I've done a wiring tuck and replaced heads cam and headers and painted engine comp. Engine is now back together and cranks fine....No fuel pump prime, no Power to inertia switch, I haven't checked but prob no power to injectors.....What could i have done to kill power?, I've checked the fusible links and they are fine. Coil gets power w key on. I was thinking I killed EEC relay ground, but the large black wire near battery is connected and working.

General karthief · Dec 11, 2020

Diagram courtesy of Tmoss & Stang&2birds

evintho · Dec 11, 2020

Mine is for a '93. I thought they were the same. Maybe different.

HemiRick · Dec 12, 2020

I figured it out.....I had the blue keep alive power wire hooked to a ground not the pos term of solenoid. It provides power to the control side of EEC and FP relays....Where I had no power.

Electrical eec RELAY ground wire location

HemiRick

I'd be looking at jacking under the house

Blown88GT

HemiRick

I'd be looking at jacking under the house

General karthief

wonder how much it would cost to ship you a pair

evintho

HemiRick

I'd be looking at jacking under the house

General karthief

wonder how much it would cost to ship you a pair

evintho

HemiRick

I'd be looking at jacking under the house

Similar threads

Electrical eec RELAY ground wire location

I'd be looking at jacking under the house

I'd be looking at jacking under the house

wonder how much it would cost to ship you a pair

I'd be looking at jacking under the house

wonder how much it would cost to ship you a pair

I'd be looking at jacking under the house

Similar threads

Privacy & Transparency

Privacy & Transparency