Code P1919, everything electrical would turn off and back on over and over again?

Tiny
ITAFREAKINFORD
  • MEMBER
  • 2005 FORD FIVE HUNDRED
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 221,335 MILES
Okay, here goes I got back for a 1,100-mile trip in my 500/then all electrical went crazy; everything electrical would turn off and back on over and over again. Then battery while car was sitting tested alternator found it was bad, I thought, and it did now the idle gets rough and there is when it does no codes but p1919 the fuel gauge is a little strange and oil pressure warning after running a little. My question is, I looked the best I could find was it was temperature control something, so I unplugged it and as soon I did the fans came on highs speed and the A/C inside quit working. I am so stumped because all that happen was new alternator now pushing 13.9 volts battery is always at 12.7 volts. My question is, the car was running great so I don't understand what happen. Do I need to reset it adjust and components the battery was disconnected for almost 2 weeks while we got an alternator or did the temperature sensor go bad or a fuse maybe? Please let me know what you think cause I can usually figure it out but I am grasping at straws atm thank you in advance.
Saturday, July 29th, 2023 AT 3:15 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,119 POSTS
Hi,

I have a question. You indicated,"...all that happened was new alternator now pushing 13.9 volts battery is always at 12.7 volts." Do you mean when checking at the alternator, it is producing 13.9V but at the battery, it is 12.7v?

Take a look at this link and let me know if this is how you checked the alternator:

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Also, for everything electrical to stop and then start, that sounds like we are losing a connection with the battery. Are both cables in good condition, tight, clean, and free of corrosion? Did you check the negative terminal where it bolts to the engine?

I attached the wiring schematic below for the charging system. Check the grounds indicated and also, at the alternator, there is a black wire with an orange tracer. Confirm there is battery voltage present.

Let me know.

Joe

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Sunday, July 30th, 2023 AT 10:11 PM

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