I have a Series 6 with Series 7 firewall forward Kitfox that has been flying for 2 years. I have been having trouble with the trim system where it intermittently stops working. I verified the switch is ok. A friend who is an RV builder found the following link that describes an issue with the electric flap actuator used on some RVs. It explains how grease from the actuator gear box gets into the motor housing and screws up the brush/commutator electrical connection. I took my actuator out and it is the same make as that shown in the RV document. I took it apart and found that grease was indeed in the motor housing and the commutator and brushes were coated with guck which I suspect is my problem. I have reassembled after cleaning and it works fine on the bench. Time will tell if I still have the intermittent problem but I don't think I will.

Here is the link to the RV document:
http://vansaircraft.com/pdf/flap_motor.pdf

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Craig Nelson
Eden Prairie, MN