Mustang battery light problem? ?

Question

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2001 ford mustang gt 56k miles

please read the last post to catch you up on my problem.

http://www.mustangforums.com/forum/s...d.php?t=475568

well, i got a alternator and battery, went home and strapped them on.

and fired it up, as expected it started(battery has juice since it's new)

and i lowerd the windows and the volatge gauge lowered....again.

same thing when i turned on the ac/ cd player/ ect. ect.

so, i decided to drive it around on two little short trips, and the light stayed on, and the guage still dances around when i lower the windows all the way or press the breaks.

so, this morning, i noticed that the gauge drops alot when i ride or press the brakes,

so i started thinking i have a short somewhere, but as i am driving i was going around 45 and went in to a little dip type thing in the road,(sorta like a steep drive way) my car scraped a bit and as soon as i heard it scrape the battery light went off and the gauge went back to normal, so i lowered the window and pressed the brakes and nothing, the gauge stayed in it's proper position.

so i started thinking, i have a very steep drive way at home, i scrape the bottom of my car no matter the angle i hit it at. i think the driveway caused this,

but, what is under the car that would cause my battery gauge to do that????

is there any main power wires down there or anyhing?????

i am lost.........

i am already $300 in the hole. and i dont have money to be blowing like that, i live on my own and go to school and work fulltime and i need my mustang

Answer 1

3 to one you have a bad ground wire between the engine block and frame.  

Answer 2

i would look for a blown fuse in the charging system or a failed ground. it might not be a bad idea to have the charging system checked out but you can kind of do that your self with a digital volt meter. key off voltage should be 12.6, with the engine running it should be at 13.5-14.5 volts. check that and get back to us.