I need a wireing diagram for my ibanez sdgr 4 string bass it has 5 nobs one switch

Know the year etc? Ibanez have them on-site.

Ibanez com Wiring Diagrams

This bass was made by Cort in Korea, in Jan 2004. They sell used for US$150-250 depending on condition.

I'm pretty sure that model has active - battery powered - pickups, and yours is flat, so no output at all. The battery would be under the smaller cover plate on the back

http://resources.ibanez.com/resourceservicehost/images/Ibanez/web/insets/zoom/SR300SLB_Battery_Box.jpg

Most are available on the ibanez site
Ibanez com Wiring Diagrams

normally the third knob would be the mix between two pickups.

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
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The internal workings of the guitar - pickups, potentiometers, switches are not grounded.
Very common.

Replace it with the same size as the original and the original type. The 100 sounds right for the E. Make sure it is the SAME type string as there are non magnetic for some guitars and if you have magnetic pickups the bronze types won't work. There are also round wound, flat wound and some are flattened on one side. You need to make sure the replacement is exact type. Take sample of old to show store clerk.

This should do it:http://www.ibanez.com/support/wiringdiagrams

Here is a diagram:http://forum.ibanez.com/default.aspx?g=posts&t=78892