I have a 1999 F150 with the 5.4 triton v8 and 90000 miles.A few days ago it refused to start when I turned on the ignition switch. After a few tries it finally started and ran fine but when I shut it off the heater fan kept running even with the key out of the ignition. This time when I tried to start the truck it fired right up but the wipers and radio didn, t work at first. After a few minutes running they both worked fine but when I shut the truck off the radio stayed on. This time the fan shut off. The next evening when I went to get in the truck the lights were flashing sporatically and the starter was trying to engage.I started the truck but the srarter was still trying to engage so I unhooked the solonoid wire from the ignition switch and this stopped the starter from engageing but the interior lights started flashing and the 4x4 light on the dash started flashing on and off and I could also hear a relay clicking under the Dash.I talked to a local mechanic and and he thought I had a remote starter that was back feeding power to the truck. The only problem with that theory is I don't have a remote start. Any help would be appreciated, thank you
If your completely positive there is no remote starter in the truck, then I would have to say your ignition switch is a very real possibility. A quick testto verify this would be to access the main ign switch harness connector under the dash and disconnect it when the truck starts to act up. Let us know
January, 29, 2007 AT 3:20 PM
I have a 1998 F150 with a 5.4 that had the same problem. It did have a remote start when I bought it but was later removed. Ever since then I have had all kinds of electrical problems. Most of the problems you mention are the same ones I am encountering after the remote start was removed.
January, 29, 2007 AT 3:41 PM
Cape Dave, the problem with my truck turned out to be in the electrical junction box at the bottom of the fuse panel. I took the fuse panel out of the truck and opened it up enough to blow it out with compressed air, I than sprayed it with non conducting fluid film to displace the moisture. Every thing works fine now. 151A