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You don't mention of the "CRUISE ON" light comes on. If the light comes on then a blown fuse is not the problem. Most cruise problems on the 1500 (probably the same on 1800) are down to stuck switches (either clutch or brake lever, or brake pedal). The usual switches to go bad are the clutch or brake lever (they are more exposed to the weather). To test the handlebar switch, put your ear close to each lever in turn and slowly depress it. You should hear two faint clicks, if you only hear one click on any of the switches then that switch is stuck in the open (cancel) position. Sometimes a spray of WD40 or similar will loosen it up, otherwise you will need a new switch. Test them and let us know what happens.