eli.krahulec

I agree. The conceivability of this happening to 2 pickups, around the same time and both being ones that I'm working on...?!?! Could blame a non-fomoco replacement fuse on the possibility that it was changed by one of them but both trucks? These two don't really hang out so it's not like they each grabbed a replacement from the same Chinese parts bin. My dad nearly fell over when Ford sold him the replacement for $12....

Kenferg1

$12! WTF? I guess if they are that bad, that @ $12 each they will have enough to cover the lawsuits. Hell, spark plugs are cheaper.

eli.krahulec

He returned the $12 one, and bought 15 more for $17 at a local wholesale distributor. Called another Ford dealer and it was $8.50ea. While he was replacing he noticed another with a similar burn pattern. I suggest taking the time to at least stock up on a couple spare fuses, and to definitely check yours under the hood....

Kenferg1

It seems that maybe the dealership should find out what is causing such a high current draw. I would think anything shorting to ground would cause the fuse to rupture. It might be with the effort to hit one of the fuses with high current to make sure it pops. Did he check the wires in and out of the block to see if they were charred?

eli.krahulec

Have not checked the wires. Have not tried to fail fuses. Curious how 2 trucks are showing the same arcing on the blades of the fuses though isn't it? I don't believe the current draw is the problem, I think there is a problem with the location of the fuse block, or at least the sealing of said block....

papa tiger

Higher resistance in the circuit does that over some time.

gDMJoe

As in an over-worked/stressed/heated fuel pump caused by keeping the fuel level in the tank consistently low. (?)
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Upgraded2Ford

Linking the TSB for future readers like me.

papa tiger

Mostly in that situation or corrosion over time creating high resistance slowly, possibly lowering the final current flow or blowing the fuse simply via work load demand and not high enough voltage all happening over time due to said corrosion (poor connection). Looking for the corrosion trail will help. The end result usually is burned wiring type damage/melted fuses, fuse holder damage etc. The time frame is usually months or more of gradual degradation of the circuit. If it isn't clean shiny copper or silver it is on its way out.

Tanner2

Same issue for me on my 6.2. This thread saved the day! I will keep an eye on this fuse noving forward. Thank you!!