Reviving this thread. I'm finding that my CarPC is dragging my battery pretty hard - to the extent that my two year old Diehard Platinum battery drops to 50% capacity or below after sitting for just a couple of days. I haven't had any problems starting the VX, even after she sits for 4 or 5 days, but because the CarPC's power supply is configured to detect low voltage/capacity conditions and prevent the system from powering on and thus destroying your remaining capacity (pretty neat huh?) I'm occasionally running into situations where it won't come on until after I've reconditioned the battery for several hours on an external charger. This leads me to believe perhaps either my alternator is starting to weaken or I'm running too much tech gear without a heavier duty alternator.

I'm almost certain the 3.2 alternator won't work for our trucks, but if you Google "Isuzu 3.5 high amp alternator" you do come up with a number of alternatives. My question is two-fold: (1) does anybody have experience with a heavier duty alternator, and (2) how much amperage is too much? The link below lists alternators up to 175 amps when the stock alternator generates only 90 amps (if my research is correct). What is the effect of that much extra power? Do I run the risk of overcharging the battery, burning up the wiring, blowing fuses, or ruining other electronics? Looking for any and all input here.

Thanks!

http://www.qualitypowerauto.com/catalog.php?item=287