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OT-blown fuse

T

tomturkey

Well-known Member
Off Topic---- Grandsons 2003 Nissan Altima, blows the blower 15 amp fuse. We recently replaced the blower motor on it so am relatively certain its not the blower motor causing the problem. DARE I try a 20 amp fuse or am I risking letting the smoke out of the wires? Thinking maybe the variable speed blower switch could be the problem. What do you all think. BTW, he does help me bale hay and assist with a hand when I'm working on a tractor. gobble
 
Only if you have real good insurance on it since it could cause a melt down of the wires or even the computer. Very likely to have shorted wire some place or a bad circuit board
 
Does the fuse look melted or just blown? Sometimes you can tell the difference-blown usually has a blackened look. Does it blow instantly or while driving, and quits , say after hitting a bump in the road? If it looks melted, look for a loose connection-which would get hot, and create resistance,(raises the amperage draw) which could blow the fuse. Feel connections after running it awhile, to see if they are hot. If it blows instantly or when you hit a bump, then look for wires rubbing on the frame or body, causing a short to ground. Mark.
 
If possible, lift the fuse block assembly up and look at the back side.

Look for heat discolored wires on the fuse holder.

If so, you will have to cut the wire back to where the heat has stopped, splice in a heavy duty pigtail type fuse holder, power it from the same source the original fuse was. Make good, soldered, heat shrink connections, no shortcuts allowed.

Blower motors draw a considerable amount of amperage, especially when the bushings get tired, and/or the blower is operated on high a lot. Simply backing the speed down to medium will greatly prolong the life of the blower and electrical components.
 
Thanks to you all. I replaced the 15 amp fuses (2). Previously only one of them was blown??? He's running the blower on medium for now, we will see what happens. BTW OLD, if installing too big a fuse would cause a fire, I'm sure many a lemon would have been a burned up fire claim. But it would probably only melt some wires and make a mess of things. gobble
 
Ideas: There could be a leaf/stick/dead mouse stuck in the squirrel cage. There could be a short to ground before the motor. The fuse block (as noted) could be getting hot from a bad connection. The blower resistors could be shorted to ground. Does it run well, then blow the fuse after a time passes? Does it make noise? Did it work well, then quit and blow fuses?
I would pull the connector at the motor, and see if it still blows a (much smaller) fuse. It should not blow a 5 amp fuse when disconnected.
Put a amp meter in the circuit in series with the motor and see what it draws! Jim
 
Sometimes fuses blow not because of excessive current, instead fuse holder doesn't make good contact with fuse causing heat that melts fuse link.
 
I looked at the wiring diagram and there are two fuses in parallel (spliced together) for the blower motor. Fuse #10, & #11, both are 15 amp. If something was shorted downstream of the splice then it should pop both fuses, there could be a wire short, loose connection between splice and the blown fuse.
 
(quoted from post at 17:44:34 08/27/19) Off Topic---- Grandsons 2003 Nissan Altima, blows the blower 15 amp fuse. We recently replaced the blower motor on it so am relatively certain its not the blower motor causing the problem. DARE I try a 20 amp fuse or am I risking letting the smoke out of the wires? Thinking maybe the variable speed blower switch could be the problem. What do you all think. BTW, he does help me bale hay and assist with a hand when I'm working on a tractor. gobble
Click to expand...

Use an ammeter and measure the current.
 
Have you ever driven a car that had the wiring go up in flames and burn and in turn leave the whole car full of smoke? I have an it is not fun when you cannot see the road due to some one putting in a over size fuse so in turn the wires burn up and fill the car with smoke
 
I'm inclined to think the new blower is defective (assuming it wasn't blowing fuses before the replacement). Either that, or the wiring is shorted somewhere; possibly a wire got pinched when replacing the blower.
 
I had the battery cable to starter burn up once from rubbing on the block. Couldn't see a thing, very scary.
 
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tomturkey
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