Daddeo, how are you charging the battery in truck or do you just remove it for recharging? I don't know which setting you could use on a battery charger. 6 volt setting would not fully charge the battery and 12 volt would overcharge the battery and ruin it.
If you had a 12 volt generator in your truck, I not sure if the regulator voltage adjustment could be adjusted down enough so that a 12volt generator would produce 8 volts or not. Same as it might be possible to adjust a 6 volt generator's regulator to put out 8 volts. Do you have any generator rebuild shops around close they maybe able to tell you. A 12 volt alternator can be made to put out 8 volts, but you'd have to use one of the older alternators with the seperate regulator not the built in one.
