Electrical issue
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Junior Member
Joined: Dec 2022
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Electrical issue
Looking for any input, I have a 2004 f150 5.4, the other day I left my house and less than a mile away all guages, ac fan and power windows quit, truck went into limp mode. I got turned around and headed back to the house and everything came back but I had a check engine light which after connecting my code reader I am pretty sure was caused by going into limp mode. When I got home I turned ignition off and tried to restart and it wouldn't even turn over and battery read 8 volts. I jump started it and it was reading 13.7 while running. Any ideas guys?
5 Year Member
Joined: Feb 2020
Posts: 7,716
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Looking for any input, I have a 2004 f150 5.4, the other day I left my house and less than a mile away all guages, ac fan and power windows quit, truck went into limp mode. I got turned around and headed back to the house and everything came back but I had a check engine light which after connecting my code reader I am pretty sure was caused by going into limp mode. When I got home I turned ignition off and tried to restart and it wouldn't even turn over and battery read 8 volts. I jump started it and it was reading 13.7 while running. Any ideas guys?
- have batt and alt prof tested
- list actual dtc codes if/when posting about an issue.
2004 F150 5.4 Lariat
Joined: Dec 2012
Posts: 956
Likes: 156
From: Summerville, SC
When my truck had similar symptoms it was caused by a bad alternator. So as already suggested, I'd head to Advance Auto or another auto parts store for a free alternator and battery test.