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I have 2006 5.4 150. I just replace alternator and battery. However I am having an issue with the following. After either a time period or temperature the temp gauge will stop working,then work (on - off) all the warning lights come on. This will go on for a while then gauge will stay not working, lights and buzzer on. If I drive the vehicle (distance unknown) longer, tack and speedo stop working and the 4 hi/low lights come on also.
However when this is all going on, when hooked up to computer, everything (according to computer and scan tool) is working. No codes ever. Bad ground wire??? Where???
Buzzer is driving me nuts, the radio can not drowned it out...
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