Where are both fuse boxes located - 2003 Isuzu Ascender Sep 29, 2016Where are both fuse boxes located Ascender / 2003 Isuzu Ascender / Where are both fuse boxes l.. Where are both fuse boxes located (2003 Isuzu Ascender) Everytime i turn my vehicle off the back air conditioner comes on. Then my batteries. Die what do i do?is it going to be alot of money or can i just take the fuse box out . Ang2016 in Where is the fuse box located for a 2003 isuzu ascender Sep 10, 2012Just solved this problem on our 2004 Isuzu Ascender. It was a bad relay located in the fuse/relay box which can be found inside the engine compartment. The relay is number 46 (HDM) on the diagram located on the inside cover of the fuse/relay box lid. There are actually two of the same relays side by side in the fuse/relay box.