Got it back from the dyno now the battery dies.....

[EricM]

I just hooked up my battery tender and did a slow charge to 100% and I'm now waiting the mandatory 8 hours for the BMS to do whatever it does.

6.2L engines do not have the battery management system. You can hook right to the battery with your charger. There are no special ways to charge or times you have to wait.


Mine sits a lot as it's not a daily driver- I keep mine on a bettery Tender Jr. It works fine. I like the Jr. models better than the standard Battery Tender as the charging "box" is at the outlet and it's only wire going to the truck vs having the charger plopped in the middle of the wiring.

 

[Latchkey Kid]

Does the "P" for park light up on the dash? It's common in 12th gen f150s to have the parking plunger sensor in the shifter go bad and the truck won't think it's in park which leaves the dash lights on draining the battery.

 

[BuiltRight]

My advice would be as follows.
Dont start throwing money at the wall with new parts, figure out what it is, and then take care of it. Call your tuner. If theyre halfway decent, thell do what they can to help. Describe whats happening and just straight up ask if it could be related to the tune.
A parasitic draw test would be my next step, checking fuses and such. Most auto parts stores can test batteries and alternators too.

obviously different but my wifes jeep had a draw we couldnt find for the life of us. Jeep built relays into the fusebox that were inaccessable for testing or replacement. so it killed the battery. 500$ later a new fusebox and batter and she was good to go. These new vehicles are so complex these electrical issues can be a huge pain. Really hope its something simple!

 

[Latchkey Kid]

I may have figured this beast out!!! Hours of reading and research and I'm narrowing my focus down to the park position sensor in the console shifter mechanism. I've taken notice that the "P" is sometimes lit up orange-ish and sometimes not lit up at all. It has no rhyme or reason when it's on or off but jiggling the shifter causes the entire shifter indicator on the dash to flicker. I've also noticed sometimes I get in and before I insert the key, again, sometimes lit up and sometimes not. And once I closed the door causing the P to light up. As I have read further into this part it fails quite often and first sign of a problem is the auto-start function failing. I had that same first noticed issue. It's a 25-30$ part with about 30 minutes install time so if it's not the cause then no harm and not a huge hit to the bank account. I have found the same issue on the Gen12-F150 forum with all the same problem earmarks so I'm (semi)confident this will fix my issue. Well my battery issue anyway. I have several I still need to work on personally!!! (Ask all my ex-wifes)
I'm ordering the part tonight and should have it installed by early next week and I'll update everyone on the outcome. I'll try to do a workup on the install as well, for anyone that has this problem in the future. Fingers crossed!!!!!

 

[Gumby]

Well do a good one!!!.... because I will be in there .....mine doesn't light up at all. I didn't know it was suppose to.

 

[Latchkey Kid]

Well do a good one!!!.... because I will be in there .....mine doesn't light up at all. I didn't know it was suppose to.

I'll give you an update!!! Hope all is good on your end of the world!

 

[brink]

I may have figured this beast out!!! Hours of reading and research and I'm narrowing my focus down to the park position sensor in the console shifter mechanism. I've taken notice that the "P" is sometimes lit up orange-ish and sometimes not lit up at all. It has no rhyme or reason when it's on or off but jiggling the shifter causes the entire shifter indicator on the dash to flicker. I've also noticed sometimes I get in and before I insert the key, again, sometimes lit up and sometimes not. And once I closed the door causing the P to light up. As I have read further into this part it fails quite often and first sign of a problem is the auto-start function failing. I had that same first noticed issue. It's a 25-30$ part with about 30 minutes install time so if it's not the cause then no harm and not a huge hit to the bank account. I have found the same issue on the Gen12-F150 forum with all the same problem earmarks so I'm (semi)confident this will fix my issue. Well my battery issue anyway. I have several I still need to work on personally!!! (Ask all my ex-wifes)
I'm ordering the part tonight and should have it installed by early next week and I'll update everyone on the outcome. I'll try to do a workup on the install as well, for anyone that has this problem in the future. Fingers crossed!!!!!

Glad I was able to help. For other people wondering if you have this issue: the P on the dash cluster should be lit up orange if functioning correctly. If all the lights are white and the shifter is in park then you need to replace the plunger switch.

 

[Latchkey Kid]

Ordered the part. Will be here next Wednesday along with the battery tender. I'll knock them both out in one session!

 

[Gumby]

Glad I was able to help. For other people wondering if you have this issue: the P on the dash cluster should be lit up orange if functioning correctly. If all the lights are white and the shifter is in park then you need to replace the plunger switch.

OK now I am confused. Is the shifter P-N-D-M-ect has an orange dot that moves. is that supposed to be lit? or are you talking about something on the dash screen?

 

[brink]

OK now I am confused. Is the shifter P-N-D-M-ect has an orange dot that moves. is that supposed to be lit? or are you talking about something on the dash screen?

Right below the screen on the dash, the gear select indicator lights. "P" should be lit up orange like the picture below. If it stays white like the rest of the lights in this pic when in park the switch is bad.