1999 dodge durango wiring

I am currently truoble shooting a electrical issue in my durango the interior lights are not working, how do I build a 12 volt 10 amp wire to connect to the battery to continue trouble shooting this issue Diagnosis on the fuse box i used my multi meter to measure the voltage. it was at 12 volts on the bottom hole of the fuse port. Nothing form the top hole of the fuse port. Next I used the multi meter to measure amps across the circuit 40 amps (on a 10 amp circuit) nothing comes from the top hole. like i said 40 amps from the bottom hole to a body ground.so i want to test the upper hole via a new power wire so i can see which direction i need to trouble shoot from the back of the fuse box.

Thanks,

Jon 

Voltage is measured in parallel, Amperage is measured in series, if you wante to measure Amps, set your meter(DMM) dial to 10A, depending on your DMM you might have to unplug the red lead from volts and plug it in to 10A, then pull your fuse out and put the black lead to the top terminal and your red to the bottom, if your light doesn't work to begin with you won't have any load so your meter should read 0 on Amps.  Your door trigger is BLACK/ BLUE (-) or TAN/RED (-), it is in your kick panel, black plug, when your door is open, you should have a ground on this wire if not check your door switch, might be in your door latch, could be rusted