Big Red Battery Warning

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Oct 22, 2019 | 08:16 AM

#16

truetechtesting

New User

Joined: Oct 2019

Posts: 5

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Quote:

Originally Posted by F150&EB

This past Monday afternoon, I was pulling away from a stoplight and the truck had almost no power. I thought the engine was about to die, but it kept going - just accelerating very slowly. I glanced down at the gauges, but there were no warning signs. That's when I realized the speedometer wasn't registering, the odometer was blank and the MPG readings were blank as well. I pulled into a parking lot and let it sit there running for a while, then decided to take a gamble and limp it to a dealership a few miles away (the same one that re-flashed the PCM for the transmission recall.) Made it there without issue, but the transmission seemed to want to stay in 3rd through 5th gears. They finally had a chance to dig into it this morning, and determined that it needed a LEAD FRAME CONNECTOR EXTENSION, which was covered under Recall 19N01 2.20. No charge to me.
Apparently this was not related to the battery warning light that started this thread. For that issue, they seemed pretty convinced it was the alternator, and gave me a quote of $1300 parts & labor.

I told them thanks, but no thanks and purchased an alternator and two new serpentine belts for $425 at the local parts store. Took about an hour and a half to replace, and I didn't even bleed!

Hopefully that ends this saga.

I know yours is a 5.0, but its doing exactly what mine is doing.
did that alt fix your issue??

Oct 22, 2019 | 09:38 AM

#17

seventyseven250

Lead Driver

Joined: Jun 2005

Posts: 8,434

Likes: 708

From: Calgary Canada

If it was me, I'd clean and inspect any connections I could access easily, then I'd fully charge the battery on a smart charger (a few hours one evening) then I'd disconnect the charger and do that BMS reset procedure.

Next step if I still had problems after that would be taking the battery somewhere that can do a full LOAD test on the battery. I know one of my local parts stores does this, and another only tests voltages, not sure about dealerships but it doesn't hurt to ask what they are testing as well as getting the test results printed out to take with you.

Those steps are easy and don't cost money, and that's how I always like to start.

Oct 22, 2019 | 11:45 AM

#18

F150&EB

Thread Starter

Junior User

Joined: Nov 2005

Posts: 69

Likes: 0

From: Austin, TX

Quote:

Originally Posted by truetechtesting

I know yours is a 5.0, but its doing exactly what mine is doing.
did that alt fix your issue??

Unfortunately, no. It was fine for a few weeks, then it started happening again. I then replaced the battery, which was ~2 1/2 years old. The issue hasn't cropped-up since, but I'm not 100% sure it's solved. A buddy of mine theorized that the original alternator may have been intermittently overcharging the battery, causing it to off-gas and form corrosion on the terminals.

Mar 4, 2024 | 01:59 PM

#19

STMPD1

Trailering

Joined: Mar 2024

Posts: 17

Likes: 0

I've read through many many posts today about the Fuel Pump fuse #27 issues. Mine 20a fuse burned up about a year ago. My truck would not start. It would just turn over but not start. I found through research it could be the #27 fuse. I replaced the fuse. Everything seemed good.

Sometime later, after replacing the fuse, my Battery light has started coming on every time I start my truck. Does anyone know if the in the TSB - 15-0137, if the MIL (malfunction indicating light) mentioned in the TSB could be my battery light?

After replacing the 20amp slot #27 fuse, I have not had any starting issues with the truck.

2012 F150 XLT. 3.6/V6.

Thanks everyone,

Donnie (STMPD1)