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Can I use a 25 amp fuse instead of a 20 amp on my Ford Excursion?
My blinker, hazard and brake lights were all not working. I had one of those fuses that lights up when it is out, and it did. So I changed it, but it lit up again. It calls for a 20 amp. I found a 25 amp and put it in, and they are all working again. The manual says it can cause a fire if I have a larger amp than it calls for. Is it okay, or should I get it checked out? Could I just unplug another fuse that isn't necessary to prevent an overload on the system?
It turns out the new 20 amp fuses that I bought were bad. I went on my 4th trip to the auto parts store and got some new 20's and it worked perfectly. Problem solved. Thanks for all your help everyone!!
In theory it could cause a fire. The odds of 5 amps over design specification causing a fire? Not very much.
When engineers design systems they will "over design" them as to prevent failures.
For example you have a swing set that is designed to hold 250lbs Max. Does that mean once you put 251lbs it will break? Of course not. More than likely it will be able to hold 500+lbs.
In summary, this is a good temporary fix... but why risk an electrical fire for a $0.50 Fuse? Go to your local auto parts store/ walmart. Its a common item. If you keep blowing the 20Amp fuse, you may have a short somewhere. That would need to be fixed asap. A short could easily cause a fire, no matter what fuse you put in it.
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