surges seen with lights at night

Have the charging system checked out-start here

We took it to Auto Zone and the scanner showed nothing wrong with the starter or the battery. No codes came up on their scan-tool.

Have the alternator checked

I am sorry, I just noticed I said we changed the starter and had the starter checked. That is incorrect! They checked the alternator and it checked normal but we changed it (the alternator)anyways.

Could be the computer controlled circuit of the alternator field generation is malfunctioning

Hi Again,
So in plain lay-man's terms- how do you trouble shoot this or know if it is the Computer-controlled circuit of the alternator field generation...and do you have a diagram,schematic of what you are referring to? I have no idea what all that means. Could you please explain this in further detail? Thank you.

See below-you might probably replace the computer if the wiring from the alternator to computer checked-out good

Hi Rasmataz,

See below where? I don't see a diagram or where you are talking about? Could it be a bad ground or corroded wire somewhere? Thanks.

One more time on diagram