Electric Fan Wiring

It's not you, it's the car and the charging system design. If you hook power at the battery, you are running ALL the fan amperage through the bulkhead connector twice and ammeter (if still in system). That a POOR way to do it and it's the system routing that is the issue. Run a wire around and that will alliviate the issues.

People don't have problems with this stuff until things start melting and you have a disaster on your hands.