back up lights

I'm having a problem with my back up lights not coming on 95% of the time when i shift in to reverse (t-3650) i've checked all the under dash fuses and now i'm thinking it might be a relay under the hood somewhere, i'm about to go through my haynes manual and look @ the wiring diagram and see what's what.
any suggestions?

thanks
joey
 
Is this the part? $20 from Advance, I need to get one too - Mine have been out for quite some time now.
 

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