Flex FWD V6-3.5L (2010)
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Measure the voltage between the trailer tow C4099-5, circuit CAT14 (OG), harness side and ground.
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Is the voltage greater than 10 volts?
Yes
REMOVE the known good relay. INSTALL a new trailer battery charge relay. TEST the system for normal operation.
No
REMOVE the known good relay. GO to AD4.
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AD4 CHECK FOR VOLTAGE TO THE TRAILER TOW BATTERY CHARGE RELAY SWITCH
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Ignition OFF.
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Measure the voltage between the trailer battery charge relay pin 5, circuit SBB30 (BN/RD), BJB face side and ground.
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Is the voltage greater than 10 volts?
Yes
GO to AD5.
No
VERIFY the BJB fuse 30 (30A) is OK. If OK, REPAIR circuit SBB30 (BN/RD) for an open. TEST the system for normal operation. If not OK, REFER
to the Wiring Diagrams to identify the possible causes of the circuit short. See: Diagrams/Electrical Diagrams/Diagrams By Number
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AD5 CHECK FOR VOLTAGE TO THE TRAILER BATTERY CHARGE RELAY COIL
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Ignition ON.
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Measure the voltage between the trailer battery charge relay pin 2, circuit CBP33 (WH/BN), BJB face side and ground.