E4OD electrical problem
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Freshman User
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E4OD electrical problem
Hi all helpful people!
I have a problem with my truck.. It's a 1991 F350 7.3 4x4..
When I drive around with the light switch off.. it works just fine.. as a dream.. But when I turn the lights on, pull the switch to the first click (or the 2nd) it's like the gear jumps out.. and does not really jump in again until I push the throttle.. This is noticable when I'm driving 50-60mph
If anyone have had this problem I would greatly appreciate you sharing your story
Do I dare to drive around or should I be afraid of getting damage to the gearbox?
I have a problem with my truck.. It's a 1991 F350 7.3 4x4..
When I drive around with the light switch off.. it works just fine.. as a dream.. But when I turn the lights on, pull the switch to the first click (or the 2nd) it's like the gear jumps out.. and does not really jump in again until I push the throttle.. This is noticable when I'm driving 50-60mph
If anyone have had this problem I would greatly appreciate you sharing your story
Do I dare to drive around or should I be afraid of getting damage to the gearbox?
Fleet Owner
Joined: Oct 2005
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From: Kentucky
Check/clean the grounds on the radiator support (driver side) then for giggles and grins do the same for the grounds near the starter relay/battery on the passenger side.
I have seen poor grounds cause transmission and driveability problems when the headlights were on more than once.
I have seen poor grounds cause transmission and driveability problems when the headlights were on more than once.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
The Transmission Electronic Control Assembly (TECA) is tied to ground G100 on a diesel truck along with the headlamps, marker lamps, etc.
Postmaster
Joined: Aug 2005
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From: Cleveland, TN
A bad ground for a tail/brake light could be letting power back feed to the brake light circuit through the bulb from the tail light circuit and cause the torque converter to unlock..
All it takes is a tap of the brake pedal enough to light the brake lights to drop the lock-up converter..
All it takes is a tap of the brake pedal enough to light the brake lights to drop the lock-up converter..
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Freshman User
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So I think we've established that it's most probably a problem with the ground!? Where do I find the ground to the tail and brake lights then?
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Fleet Owner
Joined: Oct 2005
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From: Kentucky
G106 is the ground leading from the negative side of the battery to the engine block. It may also have a tie-in to the frame along the way. Diesels have two batteries so the path may be slightly different.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
G100: Located on the radiator support (driver side).
The drawing above does not show the second battery for your diesel, but the ground should be in the same place as far as I can tell.
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