I have replaced the bulbs and checked the fuse. The lights still don't work. My assumption is it must be the back up light switch, but where is it?

on the transmission

Where on the transmission?

Me again, I have a '98 Isuzu, I have the same problem, what do I look for and where on the tranny is it? New at this.

Try left hand side of the tranny by the pan

Thanks I will do that. It doesn't tell say in the manual where it may be.