Have a 98 Prelude.

I've confirmed that the bulbs are good. The cable is plugged into the transmission, all other connectors are good, and the fuse is good. All other lights work properly.
I've had the engine/tranny pulled since they last worked and the battery relocated to the trunk. Where exactly should I start tracing wires or something to get these bitches working again?

 

I would test and replace the reverse light switch (if it's broken), it's rather common for it to go out on Preludes.

 

I read somewhere on here that besides that, certain changes with the wiring harness can **** it up. After engine work, I put in a P28 with S300 and the only other thing was a OBD2A->OBD1 conversion harness. I don't see how that'd affect it but I hate dealing with electronics... That shouldn't affect it should it? The car has always been 5 spd.