Alternators and TPI
Racer
Joined: Nov 2002
Posts: 359
Likes: 0
What is the output of the 77 alternator? What accessories are you running on the 77? I think stock tpi f-bodies ran 105 amp alternators. The b4c police special cars ran 140 amp alternators. The alternator has to put out as much power as the car's electrical load demands plus a little extra to charge the battery. If you are going to run electric fans for the cooling system, that adds a little to the draw. A/c will also add to the current draw. I doubt if the electronic fuel injection system of a tpi really draws all that much power, but the ecu is very sensitive to low voltage. Like any computer, it demands a good solid 12 volts at all times.
Thread Starter
Racer
Joined: Jun 2004
Posts: 322
Likes: 0
From: The Dirty, Dirty South
In addition to the TPI I will have the dual fan set up off the GTA, AC, and an aftermarket stereo plus 100 watt amp. I average 14.4 volts but that drops when I roll down the windows, or at night when the headlights are on. The stock alternator puts out 63 amps @ 12 volts (I think).
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