Fuse that protects another fuse..Weird?

[ExploringOptions2004]

Hey guys so heres what I'm looking at. 2004 ford explorer XLT in my central junction box I have no power at fuse f2.28 and f2.29. Both circuits are dead. So f2.27 fuse protects the DTR 28 protects radio and f2.29 protects f2.28 and the DTR... What am I not understanding? Why does one fuse circuit protect another and how come I have no power to the circuit f2.28 and f2.29... Does anyone have any info on a wiring diagram for where these go? If I have no power at the fuse box should I take the entire thing out and inspect it? Help is greatly appreciated. Electrical is not my strong suit!

 

[ExploringOptions2004]

Hey guys so heres what I'm looking at. 2004 ford explorer XLT in my central junction box I have no power at fuse f2.28 and f2.29. Both circuits are dead. So f2.27 fuse protects the DTR 28 protects radio and f2.29 protects f2.28 and the DTR... What am I not understanding? Why does one fuse circuit protect another and how come I have no power to the circuit f2.28 and f2.29... Does anyone have any info on a wiring diagram for where these go? If I have no power at the fuse box should I take the entire thing out and inspect it? Help is greatly appreciated. Electrical is not my strong suit!

Update: Looking at another photo here i see that fuse 28 is only powered in the start position. So this may hold true to fuse 29 also. I will have to check that tomorrow with key in start position. And see how that goes.