[CamPoo]

I would find out what is being powered by that circuit, then trace the wire on each one from the fuse box to the item. One or more has a short on the hot wire. Luck.

 

[Pvt-Public]

I would find out what is being powered by that circuit, then trace the wire on each one from the fuse box to the item. One or more has a short on the hot wire. Luck.

That’s the only thing to do. Find the short. It can be a power wire or in one one of the components ie. relay, actuator, or even the ECU itself.

 

[shmn]

Year? Engine? Etc. Need more info about your vehicle.

There are two IG1 fuses. Look in your owner's manual to see what they power.

 

[RTFM]

The IG1 fuse powers half the stuff on your truck when it’s powered to Ignition, first click of the key.

have you made any mods to the truck? Added fog lights new stereo,etc Right before the fuse started blowing. You will be daystracking that down without some clues.