You need to do some testing to find out why ! Voltage drop testing on power an grounds ! Using a DVOM - digital volt ohm meter ! Videos on youtube . The Trainer 50 How to use current as troubleshooting aid The Trainer 49 Testing the positive side of an electrical circuit The Trainer 18 Electrical Testing Tips You can find wiring diagrams at http://bbbind.com/free_tsb.html
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You need to do some testing to find out why ! Voltage drop testing on power an grounds ! Using a DVOM - digital volt ohm meter ! Videos on youtube . The Trainer 50 How to use current as troubleshooting aid The Trainer 49 Testing the positive side of an electrical circuit The Trainer 18 Electrical Testing Tips
You can find wiring diagrams at http://bbbind.com/free_tsb.html
Something binding the fan when installed.