Does anyone else’s voltage drop to the red when you turn on the headlights? Thanks

 

That doesn't sound normal, it happens ONLY when you turn on the headlights and no other time??? If so that sounds strange and I don't know what to tell you, but someone else might. You may need to get your alternator checked at a auto store and get a new one like I did. Good luck.

 

I should have been more descriptive in the problem. It does it when i am stopped at idle. I have the hypertech under drive crank pulley and when i turn on my A/C it drops down some but not in the red like the headlights do. Thank for the reply

 

i have the march pulley kit and it does the same thing at an idle but i think its normal for the pulley kits i mena correct me if iam wrong i have a brand new batterie and alt n it still does it

 

Thanks for the info

 

Mine drops to red when im idling for more than 15 minutes with AC on full, music blasting, headlights and foglights on. Get rid of the underdrive pulley.