I run a chevy/gmc trucks with saltdogg 2000 and boss 9'2" XT. I had a problem with the batteries dieing when you are moving the plow a lot and salting on and off. I through in the highest cca(coldcracking amp) batterys i could find. This helped but then i swapped out the 105 amp alternators and through in 145 amp alternators. Fixed the problem. DO NOT put in a rely its a waste of money, if the high output does not work, through in the diesel battery setup of your truck, usually concists of cables and a battery pan. But you should be good with just the alternator. PS check all plow and battery connections to make sure they are tight!!!!!! that will kill your power faster then anything.