Power lost to HU in Caravan

Hey all,

I've been working off and on a Dodge Caravan.  A couple weeks ago I put in a flip-down screen, a modulator, and a DVD player.  Everything worked fine.  Today I went to add some wireless headphones to the same van.  After I tapped power for the IR transmitter to the headphones, all four of the new devices lost power as well as the head unit.  I also noticed later that the power locks were down too, which could be a big hint.  Oringally, for power to all the new devices I tapped the power wire for the headunit.  That's five compontents feeding off that wire: the headunit, DVD player, modulater, headphones, and screen.  I'm guessing this blew a fuse cause when I checked that same power wire behind the headunit, it has no current.  I had to stop cause I only had a couple of hours so I was only able to check the fuse for the headunit.  It's not blown.  I also took a quick look in the fusebox under the head and checked the relevant fuses there and they are fine.  Anyone ever had this happen or have any ideas I could check?  I don't think I should need to tap the battery and use a distribution block for those five low watt devices... but I need to get power back, especially to the headunit.

SigiDeba