instrument panel goes haywire
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instrument panel goes haywire
I recently changed the battery and alternator, both were tested and the battery was not holding a charge and the alternator with a load on it only read around 12V. I was test driving the vehicle (sorry 2004 F 250 Super Duty 5.4L) and the instrument gauges were going crazy along with the radio went off and on. I took it home and was letting it idle, it was idling fine but I reved the engine to around 2500 the dash lights got brighter, radio turned off and on the tach and speedometer pegged out along with gas, oil and temp gauges, also battery light came on and off and ABS light came on. You could also hear a clicking sound while all of this was going on. I know now that when I was driving the vehicle it only happened at around 2500 RPMs. What is the problem? PLEASE HELP!!
Lead Driver
Joined: Sep 2003
Posts: 5,844
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From: Albuquerque
Welcome to FTE!Sounds like either the alternator was not installed properly...or the alternator is faulty. YES...even new sometimes come out bad.
What is the reading on the new alternator? Should be 14.4V at 1500rpm. Take another look at the connections at the alternator and the battery.
biz
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Checked all the connections today and all seem fine. Had a friend hook a computer toit and everything also checked out. So we tested the alternator and when you get the truck to 2500 rpms, the alternator jumps to 18V and then to zero then back to normal. So I guess the alternator is bad. Parts place is getting me a new one.
Fleet Mechanic
Joined: Oct 2004
Posts: 1,394
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From: Southern KS
Once on my 07 my battery went completely dead while installing my stereo. I had the doors open and it just ran down. I jumped it with a charger the the instrument panel started going crazy.
It has never done it since.
It has never done it since.
Lead Driver
Joined: Sep 2003
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From: Albuquerque
Originally Posted by jack.w.bailey
Checked all the connections today and all seem fine. Had a friend hook a computer toit and everything also checked out. So we tested the alternator and when you get the truck to 2500 rpms, the alternator jumps to 18V and then to zero then back to normal. So I guess the alternator is bad. Parts place is getting me a new one.
Glad to see you are on the right track.
biz
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I changed to alternator out yesterday (getting to be a pro at-- did it less than 5 minutes) and now my truck is running great! Thanks for the help. Would have never thought a brand new part would be defective.
Truck pics coming soon!
Truck pics coming soon!
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