I've got a 92 with 130 amp 3g that was done correctly ( 4 gauge with fuse for power and 4 gauge ground ) Volt guage just started to read slightly above 1/2 upon start up and at 1/2 or just below after driving for awhile. Running the blower motor makes it worse. Tested the alt. in car and had 13.7 - 13.9 with lights on and battery passed load test. Gauge won't go below 1/2 before with the light on and blower motor running. Any ideas ? Cluster voltage regulator ? Note - smog pump removed and running shorter belt , cats removed , egr removed , stock bottom end with gt40 p heads , explorer uppper and lower , ford headers and stock aod trans.