I learned a thing or two in a recent post about headlight relay and why it is better to come off the alternator post for high current devices. By going off the alternator post 99% of the time no current to the high current device is running through the cars OE wiring. If you go off the battery the alternator will have to generate enough amps to power the fan and keep the batt charged and all that current had to go through the cars wiring ammeter, bulkhead connector etc.
