Fuse in car

I know the fuses burn out to save wiring. But why do they burn out for no reason. My car had 3 fuse blocks it took me 10 min in 97 degree heat to find the culprit.
 
There's always a reason.

Could have been a temporary overload. Will it return? Probably unless the problem is found.

Or a bad connection where the fuse plugs in, especially if it failed in the connection part of the fuse instead of melting in the usual place.
 
Thanks for your replies. That isnt what I wanted to hear. The wiring in the car is a nightmare. More wiring than space shuttle?
 
Never had a fuse blow from age, there is
always a reason. DO NOT PUT A BIGGER FUSE
IN PLACE OF WHAT IS SPECIFIED. That is a
sure fire way to burn up a modern car.
What kind of car and what fuse was blown?
 
but it's usually something more serious! I'm in the process of troubleshooting my home AC, started out with a blown fuse, need a new power supply, and probably the compressor start relay. but I've got that jumpered, so it's running, it's 86 outside, 74 inside!
 
Usually that is from an accessory that was plugged into the socket, or a metallic object stuck in the socket ( coin, ring etc. ).
 
You know if the fuse didn't burn the wire would burn, probably in a place it would be a nightmare to repair or replace. There has to be a reason the circuit is overloaded. It might even be in the fuse block itself but there has to be a problem somewhere. Now finding
an electrical short may be a nightmare in itself. You pretty much have to trace the wire from the fuse to the device and inspect every connection and hope somewhere the insulation isn't rubbed off or chewed by a rodent between.
 

If the fuse doesn't blow the wire heats up. when the wire heats up the insulation starts to burn. When the insulation starts to burn, the insulation of other wires in the harness starts to burn. After a little bit the smoke gets so thick that you run off the road.
 
Fuses are stressed each time the circuit is tuned on,they may never fail, or just burn out. I
replaced the horn fuse in the Ram a few weeks ago and it has worked fine since.. The horn beeps every
time you lock the doors. It has beeped a lot in 165,000. miles
 


High current draw cycles such as heating a cigarette lighter will cause expansion and contraction at connections. the cycles will cause the connection to loosen which will generate more heat, which will cause higher amp draw. We used to replace OEM terminals on heater element contactors with special ones made of tungsten when we noticed insulation melting, in order to prevent fires.
 

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