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Originally Posted by Rooster300SD
Number 7 had the wrong fuse in it: 25A fuse instead of a 16A!!
#7 controls the electric passenger mirror and I recently
replaced the shifter console with a nice one I found at the JY.
I will ditch the "new" mirror control switch and put my old one back in.
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There's usually only three reasons someone replaces a smaller fuse with a larger rated one: they didn't have a spare of the same rating, they added something to that circuit that draws more, or they were ignoring an intermittent short.
Unless there's something non-standard on that circuit, then the PO was probably ignoring an intermittent short that became, um.. not intermittent on you one day.
And yeah, switches do fail, causing smoked wiring. Happened on our Expedition last year.
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Can a short like this damage the alternator?
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Its possible, but probably not.