My 24.1 Vegas had heat pads on both the grey and black tanks. The black tank pad was falling off when I took delivery, grey tank heater was well adhered.
Look around the sides of the grey tank for wires with broken or bared ends. I have heard of heat pads being lost to the road once the adhesive let go.
Rather than duct tape I removed my loose pad , cleaned the old adhesive off the tank and the pad and reattached with 3m spray adhesive.
If you use duct tape it may fail due to undercarriage heat.
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