Help PLEASE

[SheenaS]

Just put a brand new alternator and battery in my 94 Ford Explorer and the battery light keeps staying on and the battery gauge on the dash is vibrating from high to low rapidly! Can someone please tell me what might be wrong so I can fix it. Thank you

 

[donalds]

Do you have a volt ohm meter
To test the battery with the engine running

 

[roscoe 0202]

check 15 amp fuse in under hood power dist box there is one for the alternator to power it up so it will charge
roscoe

 

[94Sport5]

Make sure your voltage is around 12v with engine off, and inbetween 13.9(hot)-14.5(cold) with the engine running. Also, re-check your alternator's voltage regulator plug make sure it's in all the way. Did the gauge ever move erratically before you replaced your alt/batt? A bad ground can cause this too..