Thetford Aspire Service Manual page 21

The 12v Fans, continued
Using an adjustable or 7mm
spanner release both the top and
bottom nuts and shake proof
washers whilst you hold the screw
still with a stubby screwdriver or
your fingers.
Replace fan or fans and connect
both sets of positive and negative
wires together using crimps. Be
sure to correspond the wires to
ensure correct polarity. The fan
side that has the label on should
face inward towards the appliance.