help on under the hood fuse box

HTD BL is heated back lite, your rear window defroster.

you sure its not the EEC fuse. Real easy to count from the end and look at the diagram and not notice the one says "not used"

The EEC fuse? Something has shorted out.

More then likely a dead short to ground.

I wrote a little write up on how i find shorts in this thread:
http://www.stangnet.com/mustang-forums/832480-please-help-me-fix-electrical-nightmare.html

I seem to have a knack for finding electrical shorts pertaining to that damn EEC fuse.

What you want to do is start grabbing the harness and shaking it till you can get it to where it doesent pop a fuse. When it doesent pop a fuse you moved something stopping the possible short. With the car running (do this carefully) start shaking harnesses till you hear the car either bog down or cut off. At this point your close. Listen and look for small signs of sparking or arcing...

In order to save money MAXI fuses are expensive. When i had a similar problem i ran all local stores out of their stock. Buy one of the inline fuse holders with jumper wires like so:

And a resettable circuit breaker fuse (kinda like this):


These and a multi meter are basically my only short finding tools. I know there are more advanced tools to do this but i work with what i got.

Common places:
Injector wires
Canister Purge solenoid