well my voltage hasnt been up to par lately even with zzp's stage 1 voltage booster. b4 the voltage booster ym voltage via LS1M was around 14.5-14.7 and after adding it it tayed the same but lately the voltage was also dropping down to 13.8 every so often at idle. alternators a lower mileage and the battery's a bit over a year, but its not a high-powered battery like optima, just a generic one. i got the alternator rewire as well but i guess thats not doing the job either.