[undy]

The Painless Wiring harness provided with our cars (or at least in mine) was woefully inadequate in a lot of it's wire sizing. I was getting terrible voltage drops every where. I ran new 0 gauge main wiring with #10 for my headlight circuit, #8 for my engine fan and a #10 for the ignition circuit. I went with a one wire 160 amp alternator, also rated at 70 amps output at idle. The idle rating is probably the most critical output requirement that we usually suffer from. The difference from 12.5 volts and 14.x volts will also cause your meters to read differently.

With my LSC, with the original wiring harness and alternator I was getting 10.4 volts to my fan with everything running at idle. I was drawing heavily off the battery. The wiring and the alternator just couldn't keep up. After all the modifications I now maintain 14.2 volts running at idle or cruise no matter what's on..