Plus one with the above..... at the same time, wouldn't hurts to test the battery, or altenator too. Doesn't matter if either were replaced within the last year or not. I've seen it where an altenator kept being an issue on a buddy's car once, they were just defective from the supplier. The factory oem one will go on for a long time, but the replacement ones could last a year, or less, or more, same goes for the battery.
Even dirty battery terminals will give you issues. It's good to keep those clean yearly, preferably after winter in the spring.
2008 Oxford White F150 FX2 SPORT Super Crew,5.4L.
2003 Satin Silver Clearcoat Mustang GT,4.6L 2V,5 speed.