Quote Originally Posted by 1gary View Post
I know you're asking about a alt.Are you reading 14 while at a idle??.What is the current output of your alt??.What size cable are you using for the battery to ground,engine to ground,charging wire??. The min's for grounds is 0/1,and the charging wire should be a number two wire.Could it be that your current wires are two small??.Just if I can trying to help you save some money.
Checking the voltage at the alternator, not the battery. At idle it only puts out about 12.3 to 12.5 volts. Raise the rpm's a little, say 1000 and it will get up to 14.1 or 14.2 volts and that is with nothing on. Start turning stuff on and it drops especially when the fan kicks in. At idle with the electric fan running it only puts out 11.6 volts which is bad. It's never shown to be charging much if any at idle but going down the road it's fine. It's supposed to be a 100 or 110 amp, I can't remember for sure. The Tuff Stuff looks to be the best one for the money and I would get a 1 wire if it charges good at idle but if not, I'll go with the standard 3 wire.