I couldn't find anything online on how to do this so I had to figure it out myself. I drew a picture hope it makes sense.
1. Lift seat
2. Remove battery clip and battery
3. Remove metal battery receptacle, you will see the 3 drive belt pulleys throw the battery hole
4. Pull pulley 2 towards pulley 1 and run belt around all 3 pulleys as shown in the attached picture.
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