Hey, new on here, and need help.
I've got a 92 F250 7.3 idi non turbo with the automatic E4OD trans
I just put some new battery cables on my truck and got it running with fully charged batteries.
I went back to truck after getting it started 2 hours later the batteries were dead
So I read on this site some info to replace the voltage regulator. I got the truck started but
Now the truck is running and the transmission went into limp mode so half the tach doesn't work either. So... my question is how do I reset the computer to take the trans out of limp mode and if my batteries are still draining what's my next step?

 

Welcome.

Let's start with the knowns:

You put new battery cables on truck. Why? Did this condition exist before you put on new cables or after? If only began draining after, then you most likely have isolated the root cause. Make sure your new cables are wired in correctly and all contact points are clean, shiny, and making solid contact.

"Got it running with fully charged batteries." Had the truck been sitting for a while? I can infer a lot from that statement. As in truck wasn't running. Batteries were dead as a pre-existing condition.

"Replaced the voltage regulator." Why? Were batteries not recharging while engine was running? What does the voltage output of the alternator read while running?

If your batteries are still draining, you get the enjoyable task of chasing wiring to see where you are getting current draw when you shouldn't. Anything electric that is not original to the truck is where I'd start (radio/sound system?). Any "suspect" wiring (electrical tape/wire nuts) into your hot wire. Check your fuses to see if current is being drawn through them with key in "lock"". If the truck was sitting, you may be looking for where a mouse chewed insulation to make a comfy nest, but by inference of "I've got" rather than "I just got", it appears this is a vehicle you've owned for some time with a new issue. But if it sat for the winter....

[Personal aside that means nothing to anyone. Our neighborhood has stray cats. They like to crawl up in the engine compartment to stay warm...even if the vehicle isn't running. My significant other grouses about the "stupid cats." I tell her who cares? They aren't bothering you. They run away when we go outside. And we don't have mice in the house (or in my trucks as they sit through the winter). I just make sure to thump the fender a couple times before I start up or work on a vehicle.]

Back to you....

The transmission and computer are above my pay grade. But if the issue only occured after you replaced the cables and/or voltage regulator (I don't know timeline or driveability of the truck between those repairs), then I'd check those components and wires.

You can pull codes and reset the computer's stored codes. Plenty of threads that tell you how.

Good luck.

 

What voltage are you getting on the batteries with the engine running?