Inliners International Forums General Discussion Vortec 4200 Stand Alone Programming and Wiring for Vortec 4200

I use 8 fuses because that's the way the system is set from the factory. In the harness above you could look up the circuit number for -say- O2 Sensor 2 heater power supply, see that it gets power from Fuse O2 29, and cross reference that to fuse position 1 on the stand alone harness.