2000 ford taurus-all pwr windows , pwr dr locks ,interior dome lights not working --which fuse or relay is the one--the manual dont say and the lids for the fuse boxes dont say

Check owners manual for your fuse box location. Remove and replace blown fuse. Normally located under driver side dash, passanger side dash or under your hood

definately a short somewhere tracing will be tricky but here goes,is there a roof mount aerial above the dome light ? if so take dome light down and check for signs of water ingress ie corrosion on the bare metal parts etc,if no roof aerial move to the fuse box in engine compartment ,take the lid off which will have a list of the fuses/relays look for one's that go with the components acting up check them for corrosion ,will have to remove the fuse/relay to do this ,only take one out at a time so dont get any mixed up,then check the fuses inside car under dash drivers side particulary the window and wiper if nothing found get the OBD codes read and forward me the numbers , this might take you 10 minutes to sort or hours

Check the fuse is bad? Open look at best. Using the multimeter measure the are in good condition,more auto knowledge

You will need to check the wire harness in the driver's door. The main wire is often times broken because3 of the way it was placed.

Sounds like you have blown fuses which could have happened if you accidently short circuted something while wiring up the new stereo. Check your fuses to see if any of them are blown.

fuse #26 and possibly fuse #10 also.

The wipers will not work on my 2000 mustang. I checked the fuse and i wasnt blown.

How often do you see all the door ajar switches stuck ? Come on ! This is probably a GEM module problem ! GEM - generic electronic module . The real thing to do ,( not try ) would be to have it checked for DTC'S - diagnostic trouble codes !

Thanks for the help. I repalced the 10amp fuse that controls the dome lights and the wireless lock started working ..

There is no relay, you have a short in the system, I have fixed dozens of dome light problems on the Taurus and it was seldom the same problem from car to car, check the door switch wires first, remove the switch and diconnect it, if the short goes away the wiring is shorted to the door switch. I am sorry but there is never easy solutions to this kind of problem.