I got a 03 F150. This morning I was heading to class and when i hit the gas and made the rpms up a little bit the battery levels went up and the abs light came on and the a/c went on and off. Any ideas what it could be? I just replaced the alternater and the battery about 2 months ago. Thanks!

 

Check battery connections.

Was it raining? Belt could have slipped.

 

no it wasnt raining

 

Check battery voltage (engine off). Should be 12.66V. If not, have battery charged & tested. Check battery connections. Start engine and watch for alternator output to increase system voltage to above 14V. If no increase in V, check alt connections . Possibly a bad alt.

 

Re-built alternators are notorious for being bad.