Electrical issues at 2500 rpm
Hello good people!
I have an '08 ranger 3.0l 5spd manual w/ 93k mi that I've ran into an issue with and am looking for assistance to see if it's something obvious and/or simple before I run off to the mechanic. I need to get the vehicle up and running (and possibly sold) because I'm moving in 2 weeks.
It's been an issue for a while, but I didn't have the resources/time to fix it and have another vehicle so it was not on my priority list. I didn't drive it almost at all after it started (5-10 miles total for runs to Home Depot when I needed a truck). When I start the vehicle, no issues. Can shift no issues, runs great... unless I rev above 2500 rpm. At that point, the battery light comes on, the headlights dim, cabin light dims (if on), and even the radio display dims. If I drop back below 2500, it goes back to being fine. She idles fine, also.
I just put a brand new battery in her and had bought a new alternator when the problem originally started happening. Neither of these swaps changed anything.
The only electrical I've ever done anything with on it is plugs/wires and a K&N intake that's been on for years.
Any help would be much appreciated and thanks in advance!