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2007 Sonata Voltage Drop

2K views 3 replies 4 participants last post by  MNV33 
#1 ·
Need some help, please! My wife's car is a 2007 Hyundai Sonata with a 4 cylinder. We replaced the battery due to it starting hard. Immediately after replacing the battery, the radio and AC would turn off for a second then come back on. Was advised to change the alternator, and so I did (what a pain that was). Now we have a new battery and new alternator and new problems. The radio and AC is still turning off intermittently, but now the headlights are dimming for a few seconds at a time intermittently; all of this is happening while we are driving it. Is there anything I can do, other than chasing down every wire?
 
#2 ·
Start by cleaning as many factory grounds as you can. look under the hood for the ground wires connected to various points of the cars body. There's a couple that are hidden like under the battery tray and on the side of the shock tower. Remove the ground bolt then sand the paint down to clean bare metal. The main ground cable from the battery goes right to a ground point on the drivers fender.. There was I remeber an issue with the positive battery cable assembly and a voltage drop.
 
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