Added LED Awning lights now have electrical issues?

[D-n-Tyke]

I have a 1998 Discovery 36T that I just added a strip of LED lights under the awning. I tied the 12V power into the wires that feed the passenger side interior map light. LED lights work great, map light still works as it did before. However, if I turn I have the LED lights on along with the overhead interior entry light and then turn on the porch light it instantly blows the fuse that controls the porch, interior overhead entry light and the map light (an I am sure more things I am not sure of). I thought maybe overload so I took the bulb out of the porch light. Turned the LED back on, flipped the porch light switch on (sans bulb) and the fuse instantly blows again. I am confused? Is something back feeding? Anyone have any ideas what might be going one? Anyone familiar with the Discovery wiring and now what I am doing wrong? Any help would be greatly appreciated.

[BFlinn181]

Could the porch light be wired full time 12 v (+) and the switch grounds it out? Try unhooking the LED lights and see if the others work properly. Then check polarity when adding the LEDs.