This is my first post so bare with me, my 2009 6.7 just started this today. while cold or hot the engine will hickup almost like the a/c kicked on, and then the voltmeter goes nuts from 5-14, this clears up when at highway speed. I was thinking batteries, heat grid? its confusing since it is having the same issue cold or hot. thanks for the help!

 

grid heater cycling on and off. normal. will cycle for a few minutes OR if you get 15mph or above in speed


welcome to DTR

 

thanks for the quick info!

 

welcome