I just bought a 2007 vulcan 900 and need a free manual and maintenance guide that includes instruction for tune-up.

The pressure requirements are shown on a tag that is attached to the chain protection cover. The tag should be located somewhere around the rear tire spring on the cover.

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Repair Manuals

Repair manuals (also known as Service Manuals or Workshop Manuals) contain the information you need to perform routine maintenance and repairs. These manuals generally include periodic maintenance charts, step by step repair instructions, troubleshooting information and overhaul procedures. Wiring diagrams are usually included. If you need to overhaul an engine for example, a repair manual will guide you through the process. Repair manuals are used by the service departments of your local dealership.

Owners Manuals

Owners manuals (also known as Operator Manuals) include the information you need to understand how to safely operate the related piece of equipment. These manuals also include very basic information on maintenance but do not include detailed overhaul procedures like a service manual. Owners manuals are usually included by the dealership when you purchase a new vehicle.

Parts Manuals

Parts manuals include detailed schematics of every major system that makes up your vehicle. The drawings include individual parts as well as parts groupings. Every parts schematic has a corresponding page that lists the part number, quantity and description of the part. These manuals are helpful for understanding how an assembly goes together and for ordering parts.

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Start here: http://www.kawasaki.com/Products/product-specifications.aspx?id=580

If you don't know by looking at the service/workshop manual, take it to a specialist suspension place. You could do more harm than good.

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the oil level on my 09 vulcan 900 is 3.2 liters and you check the water level under the side panel.

Did you connect the poles correctly and are the bolts tight to keep good contacts?
Try usin a trickle charger to jump the battery.