Hey guys, quick question--

Whats the stock amperage of a 1994 lt1 alternator?

I have a BBK underdrive pulley so I know my voltage is going to be kinda low namely at idle, but I think it has gotten so bad now....Even on the highway it cruises in the yellow zone!

My only electrical accessories are MSD box and CSI pump, NO loud stereo or anything.

HELP! I wouldnt mind going to a higher output alternator but I need to know what my stock one was putting out to begin with before I choose. Any suggestions on a good size to install for this new alternator upcoming swap? Thanks!

 

93' -- 124 amp

94'-97'-- 140 amp

 

What type of problem are you having? Why do you think the alternator is defective?

 

I feel the alternator is starting to crap out, because (of course I very well may be wrong and feel free to offer advice) my voltage gauge never gets out of the yellow zone (aka 12 volts and below)....I am assuming this is not beneficial for the car especially when so many "performance" accessories are dependent on a constant voltage. MSD box, CSI pump and fans on all the time certainly put more a drag on the alternator. I understand at idle it may dip into the yellow, but at cruising speed/rpm I used to be at around 13-13.5 volts (remember I have the bbk underdrive pully) and now it sits at 12 or lower ALL the time. I was at the track the other day and occasionally it almost looked like I was running at 11.5 volts or so. More importantly I do not want to get stranded somewhere.

Any ideas?

 

With a known good battery, that is one that has been charged and load tested, the voltage across the battery at idle from a good alternator should be close to 14 volts. Also I caution you to not assume the battery is good because it is from XYZ company or cause you just charged it. Internally the resistance could be too high to either output enough current or charge properly. Also, lead particulate can short plates against each other. Regardless of whether you have underdrive pulleys or not, the voltage at idle with everything off should be close to 14 VDC. You will also want to be sure the frame ground and engine ground straps are clean, secure and tight.

Dave