volt meter

[ron831]

when i turn my heater blower on my volt gauge goes way down. i have none of my acc. on either. i have a yellow top battery (3 months old) and a 200amp alt. (2 days old). it did this for awhile so that is why i got a new alt. but my problem is still there. i'm wondering if i can check something else out in the vehicle to see where the problem is. has anyone else had this problem? or is there a relay or something i can put in to correct this problem? any help would be great. thanks ron

 

[Alec]

Maybe the problem is in the heater. Does this happen with any other accessory? I've heard of the heater blowers going bad on Explorers. Maybe yours is fighting on it's way to the junkyard.