What would cause the main fuse to blow?
A high-resistance connection at or near the main fuse heats its fusible element by thermal conduction to its melting point. The heat injected into the fusible element causes it to blow.
Why does my 20 amp fuse keep blowing?
The 20 amp fuse in my 1997 70 hp 2 stroke started to blow ramdomly about 2 weeks ago when i would try to start the motor now it has got to the point that every time i turn the key the fuse goes. Does anyone have any ideas on whats happening?
Why does the fuse keep blowing on my starter?
If the fuse still blows, there is a short in the wire leading from the “S” terminal of the ignition switch to the 3/8″ nut solenoid terminal. If it does not blow, then either the solenoid or the starter is shorted out.
Why does my bus fuse keep blowing out?
You can see damaged fuses or loose, heated connections in a thermogram and make repairs. —J.F.F. A. With more than 40 years of experience in electrical maintenance and construction, I’ve learned loose and overheated main bus connections often cause such a main fuse problem. Frequently, this problem occurs where fuse blocks plug into the bus.
Why does the main fuse blow and not a branch fuse?
A. Here are some reasons a main fuse (say 100A) blows instead of a branch fuse (rated at 15A, for instance): 1. The two fuses’ time current characteristics curves aren’t coordinated. This could be the case with dual-element, time delay, 15A fuse and renewable fusible element-type 100A fuse.
The 20 amp fuse in my 1997 70 hp 2 stroke started to blow ramdomly about 2 weeks ago when i would try to start the motor now it has got to the point that every time i turn the key the fuse goes. Does anyone have any ideas on whats happening?
Why does the fuse keep blowing on my ignition switch?
If this power fuse blows only when you turn the key to the START position, remove the 3/8″ terminal wires from the solenoid, then retry (with new fuse installed) turning the key to that START position again. If the fuse still blows, there is a short in the wire leading from the “S” terminal of the ignition switch to the 3/8″ nut solenoid terminal.
How can you tell when a fuse has been blown?
You might be wondering, then, how to tell if a fuse is blown–an actual fuse, that is. You will see that the fuse has melted, and there might be charring on the panel. A true fuse typically consists of a piece of metal, most commonly an encased wire, that actually melts when overheated. This is what stops the fault (aka “short” or “power surge” ).
Why does the fuse keep blowing on my Yamaha outboard?
While on the engine harness it connects to the lower cowl mounted trim switch. Somewhere along the way something might have chafed the red wire to ground. When the wire contacts a ground the fuse will blow as it is intended to do.