Where does the ECM ground to?
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Senior User
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From: Miami
Where does the ECM ground to?
Saturday, my truck left me stranded. I knew it was an electrical problem because the Yellow Check engine light wouldn't come on when I turned the key.
After looking at the service manual and diagnosing the connections to the ECM, I determined that the ground wires (both of them) were not getting any ground.
I ended up splicing into one of them and tapping into a good ground. Now the truck runs fine, but I would really like to know where the wires are supposed to be grounded at so I can find (and fix) the problem.
After looking at the service manual and diagnosing the connections to the ECM, I determined that the ground wires (both of them) were not getting any ground.
I ended up splicing into one of them and tapping into a good ground. Now the truck runs fine, but I would really like to know where the wires are supposed to be grounded at so I can find (and fix) the problem.
Post Fiend
Joined: Oct 2003
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From: New Jersey
Re: Where does the ECM ground to?
I ended up splicing into one of them and tapping into a good ground. Now the truck runs fine, but I would really like to know where the wires are supposed to be grounded at so I can find (and fix) the problem. [/B]
Both of them need to be properly grounded, not just one. Some, but not all of the EEC ECMs use the wiring harness to ground different parts of the circuit board inside, rather than have internal grounds looped around inside the enclosure.
Generally, grounding them to the body of the truck, or the metal dash support, or another ground wire will suffice.
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From: Miami
Originally posted by chris1978
i have an 89 f150 5.0 and the ground is left hand on top rear also check the ground from the battery to the harness.
i have an 89 f150 5.0 and the ground is left hand on top rear also check the ground from the battery to the harness.
Top rear of firewall???
4wd Low
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From: Thousand Oaks cs
I always find it annoying when people give directions and they do not tell you driver side or passenger side because there is no such thing as the left side or right side to a vehicle!!
Tuned
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From: Near SLC Utah
There should be 2 on the radiator support, one near the battery, and one near the drivers side of the radiator. There will also be one inside the cab near the fuse block. There is another ground that grounds to the frame and then to the engine block on the passenger side near the battery.
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From: Central Mississippi
Bump a 20 year old thread to ed-g-cate all us Mo-Rons.
50 years fixin' cars & trucks & now I've been schooled to IGNORE all those "R"s & "L"s stamped & cast into the parts.
Who F'ing knew?
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From: White Bear Lake
As already pointed out. Left and right are based on your perspective from the drivers seat. Kind of important because although we're all primarily used to left hand drive cars there are plenty of right hand drive vehicles out there as well. The left and right based on sitting in the drivers seat applies to both.
-Steve
-Steve
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Unless you are in England, Australia or Japan.
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From: White Bear Lake
Or driving a postal vehicle. 
More Turbo
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From: Zimmerman, MN
But seriously, picture of the dash of a good friend's '71 Chrysler VG (from Oz) that I work on.