Automatic Transmission and Blown Fuses?

Tiny
R_DYER2023
  • MEMBER
  • 1999 FORD RANGER
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 137,000 MILES
I recently purchased the truck listed above flex fuel. I purchased it with the understanding the transmission (4r44e) was bad and there was no reverse gear. I installed another 4r44e, filled the fluids to spec, and when I tried to operate the transmission there was no response (idle/rpm reduction in R, D, 2, and L). Upon troubleshooting I happened to notice there were numerous fuses blown and on the fuses which tested "good" the prongs were scorched and looked like there was an extreme power surge. One of the blown fuses was to provide power to the OBD II port. (I connected my code reader and there are no codes to read.) While the engine was idling, I noticed the battery voltage gauge indicator needle was not moving at all. I also notice I have had to jump start the vehicle the last few times I started it, whereas I had not when I first purchased the vehicle.

I'm assuming my alternator is bad, but what would cause approximately 5 fuses to blow and scorch the remaining? Is there a correlation between the transmission not engaging any gear (all the forward gears operated well, just not reverse) and the electrical issues?

Any direction on where to begin finding root causes would be appreciated tremendously.

Thank you.
Saturday, November 25th, 2023 AT 5:02 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,205 POSTS
Hi,

Certainly, the fuses could be related. Which fuses were they and where are they located? Also, when you shift, is the shift cable moving the shift lever on the transmission?

I attached the wiring schematic for the transmission below. I highlighted the fuses I feel may be a cause. Let me know if they are blown and which others are. Also, let me know if the gear indicator is working properly.

Take care,

Joe

See pic below.
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Saturday, November 25th, 2023 AT 10:18 PM
Tiny
R_DYER2023
  • MEMBER
  • 3 POSTS
Joe, thanks for your response. When I replaced the blown and scorched fuses, I didn't write down which ones were blown. I know I replaced 4 of them vertically on the far-left column as you look at the fuse panel. Numbers 13, 17, 21, 25, and 24 I changed (they look different than the others). I would have changed more but I ran out of fuses. The ones you highlighted in the attachments I will double check and let you know.

The gear selector on the transmission moves when the gear selector on the steering column is manipulated. This is the 2nd transmission I have installed since I got the ranger. The first one when put in gear didn't feel or sound like the gears engaged the same as the 2nd, that along with finding out about the fuses, and possible alternator issue since I have to jump the ranger every time I start it, lead me to find this website.

I completely understand since the transmission has electronic components it could be influenced by whatever caused the electrical issue. I'm hoping to find out what steps I need to take to diagnose and repair the issues. To me it's really odd when the original transmission worked fine except for in reverse, and I'm assuming the alternator was charging the system, I never had a need to find out until the issues with the two transmissions took me to the fuse panel. The previous owner had someone try to diagnose the transmission issue. When I bought the ranger the dash panel around the steering column was off and you could tell someone had been poking around inside.
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Sunday, November 26th, 2023 AT 8:51 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,205 POSTS
Hi,

The interesting thing here is you mentioned the failed fuses and added the others were scorched. That shouldn't happen.

I looked up the fuses you mentioned and none of them are related directly to the transmission. See pic below. When you installed the new fuses, did you check if there was power to them, specifically fuse 25 (GEM)? If not, confirm it has power. Also, the other fuses are of interest. Fuse 24 should be empty on this vehicle. It is for the clutch pedal position switch.

Do this. Disconnect the connector at the transmission and check pins 1, 10, and 11 for power with the key on. See pic 2.

Let me know what you find.

Joe

See pics below.
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Sunday, November 26th, 2023 AT 9:41 PM
Tiny
R_DYER2023
  • MEMBER
  • 3 POSTS
Okay, sorry for the delay in response, been busy as heck lately.

No power to either of the three pins. I had the ignition key turned to on for power and I grounded the clamp of the probe to the frame. Each of the 3 female plugs were lights out.
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Saturday, December 2nd, 2023 AT 10:57 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,205 POSTS
Hi,

If you aren't getting power, make sure the GEM fuse you replaced has power to and from it. If it does, we have an open between the GEM and transmission. Likely, we have a short that is what caused the fuse to fail.

Let me know.

Joe
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Saturday, December 2nd, 2023 AT 7:48 PM

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