i dont know if this the right section but my truck is having an issue during cold mornings.. my voltage will go up and down up and down for about 10 mins until the truck warms up .. when this happens my fuel pump also whines ... i just upgraded my alternator to a 145 amp(didnt upgrade any wires idk if i should of) but this didnt happen until about 2 weeks after i did that so i dont know if thats realevent .. any help is greatly appreciated ...