Battery light came on... on the way home tonight after I got on it and took her from 80 to 120 but not at WOT...If I turn the ignition off and just turn it to "RUN" then the usual happens...Fuel pumps do their thing and the lights on the dash come on...but a "BOX" under the master cylinder that appears to have alot of brake lines run to it makes a noticable "THUDD" after about five seconds...Start it up again and the battery light still stays on but flickers sometimes.....Need to drive the truck to Florida Tuesday morning so the dealer may be out of the question!!!!!!



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Black '01
Born on 5-3-01
#3603 of 6381
K&N Box Filter
Sean Hyland 2# Upper Pulley
JL 3# Lower
JDM Boost Bypass
PSP 4-Way Autologic Chip ( Tow, Street,Track, N20 Street )
PSP Electric fan&CobraR water pump
PSP Longtubes w/Twin Magnaflow
PSP FactoryTech Valvebody
PSP Deep Tranny Pan
PSP DriveShaftLoop
PSP Nitrous Plate
Nitrous Express 50-150 EFI Kit
NGK / BR7 spark plugs .036gap
Mickey Thompson ET-STREETS

 

It's a bad alternator, the dealership will prob have one, and if they don't, if they are like us, they can call the motorcraft depot that services them and have one probably the same day. I know if i need a alt. at work as long as i let them know before 11am, it will be on the daily truck at 3-4pm. Good luck.

 

Ok, is the battery light that comes on the indicator that it's a bad alt. or is it the "thudd"? Because I have the "thudd" but no lights. I just chalked it up along with the clunk and seat problems. So what is it?

 

I think the Thud is the ABS pump...but don't quote me on it!

 

nostromo, we can quote you on it because you are correct

 

Jeff: Is the Alternator "Lightning specific" or do all F-150's use them?????

 

every vehicle that has a self-sufficient electrical system has one.

seriously, id go to the dealership first thing in the morning, depending on the size of the place, they prob. will have one in stock. Its the same alt thats on reg. F150's from 97up and probably a lot of other 4.6/5.4 applications.