Nathan, The voltage to operate the fans comes from the main relay, then goes to the fan relay, then goes to the fan fail module. The normal fix: #1. Replace the fan circut breaker with a 40 amp. #2. Replace the fan fail module with a jumper. #3. Replace the fan relay with The Fan Fix. As long as the otterstat is switching ok then the above would ( fix ) the fan problem. You can see all the parts and prices on my web site www.specialTauto.com. John 11004