When I’m driving at night with the lights on, when I hit the brakes the lights dim real quick and go back to normal it happens every time I hit the brakes, the volt gauge is 14.1 it drops to 13.7 or so then back up, this sounds like the something wrong with the alternator?

Rick

may be a better word to use instead of dim is more like a flicker

 

The voltage regulator in the alternator cannot instantly correct for a sudden increase in load current, like hitting the brakes. Normally it responds quick enough that you won't see a flicker, but I suspect your voltage regulator no longer has a quick response. Your voltages look normal, except that you shouldn't see the voltmeter drop and come back up when you hit the brakes. I don't see anything harmful with a slow responding alternator and it doesn't necessarily mean that yours is on the way out, so if you can live with this idosynchrosy, I wouldn't let it bother you. In the back of your mind though, be prepaired for an alternator failure.

 

This sounds like a classic heat related alternator problem.
1. On the bottom of your alernator, there is a plastic ribbed half moon shaped plastic guard.
If you pry it off, there are 3 stator windings that are soldered to the diode board.
If you resolder these 3 connections, your problem might go away.
The alternator failure you are about to experience can be averted by checking the connections.
2. The positive cable on the alternator that goes to the battery is a thru-bolt that goes through the plastic insulator and ties the brushholder positive terminal to the diode board positive terminal.
If the plastic insulator gets hot enough in the summer time, the tension on that thru-bolt loosens up and the connection arc and sparks inside the alternator, and reduces the quality of that connection. the resistance that it causes (because it will not weld itself together due to vibration) heats up the bolt even more, and it stretches with heat.
the nut loosens up with all the start-run cycles of high amps going through the battery cable, and it makes it easy for the connection to generate a resistive connection.
Once these thing happen, the alternator slowly eats itself up with heat and resistance until it can no longer generate enough volts to keep all the accessories going.
When the heat builds up enough, a diode pops, and the alternator will no longer put out.
Got it?

 

thanks

 

Just had a similar problem and it ended up being the alternator

http://forums.corvetteforum.com/c4-t...tage-draw.html