Thanks for all of the suggestions everyone. It seems that the most suggested is that the battery terminals may be the culprit.
I used a terminal cleaner and the connection is both clean and tight. I also confirmed with the girlfriend that the battery itself is less than a year old so should be...
Hello all, first time posting and man if it isn't a doozy.
I bought my girlfriend a new head unit for her 98 4Runner. Being the handy capable boyfriend that I am I went to work installing it.
I unplugged the negative battery terminal and, after removing the stock amplifier, matched up the...