Well, I got a can of CRC Electrical cleaner and a can of CRC White Lithium Grease. For only $9.68, I sprayed all the latches with the cleaner, and that fixed the door ajar light!
I sprayed them good with the grease and worked them a few times with great results! I am not sure why replacing the switches did not fix the problem, but now it is all good!
As for a switch in the rear gate, I don't see one. There are no electrical wires going into the gate. Of course, I srayed those latches clean and lubed them up real good also.
Thank you to everyone that has helped with this problem!
