Headlight fuse (#4) blowing, why?

[87TTopGT]

I searched, but with the legendary suck factor of the Fox lighting systems I was buried in so many threads I couldn't find this particular problem.
Every time I replace my #4 fuse (10 amp) it blows as soon as I install it. Can someone please tell me what and how to check to find the short?

 

[Saleen0679]

You may want to verify the fuse rating with your owner's manual. My '88 and '93 EVTMs show fuse 4 as a 15A fuse. There are no 10A fuses in the fuse box.

 

[HISSIN50]

Sal is spot-on. My 88 also uses a 15 amper.

 

[87TTopGT]

Thanks for the info- replaced it with a 15 and the same thing happened! Something must be in direct short, what do I check?

 

[kystang1889]

does the headlight work?
if not you probably have a short to ground before the headlight

 

[HISSIN50]

Since it blows as soon as the fuse goes in, I would trace the feed from the fusible link to the fuse and switch.

Good luck.