94 LT1 Tans AM- Volt gauge and PCM show 12.9-13.4 volts when first started. After she gets hot, I assume after the fans come on, 11.5-12.5 at the gauge and PCM. Battery is in truck, new alternator, starter, custom cables (4ga.-1/0ga.) I just seem to never be able to get much higher than that. It still has the factory ground strap from drivers frame rail to cylinder head for the PCM grounds, is that sufficent, or should I upgrade. The battery stays charged, but I feel the voltage needs to be higher. Any ideas, Thanks, Chris.