Would it be normal to lose .5v when you turn on your electric water pump and another .5v when the dual spal fans come on? fans are 20a units and the w pump is 5.5a. Using a one wire denso alt from a Toyota 4runner. I think the alt could be a 100a unit, but may be as little as an 80amp unit. Brand new optima blue top with 1gauge wire to starter. Idling with all accessorys off gauge reads 14.2v. Electric fuel pump makes no difference to volts when turned on. Gauge reads 13.1 with lights and all acc on.