20 amp fuse keeps blowing

[sully853]

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?

 

[tashasdaddy]

Re: 20 amp fuse keeps blowing

you have a short in the igintion switch or wiring. or tilt system.

 

[Joe Reeves]

Re: 20 amp fuse keeps blowing

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.

If it does not blow, then either the solenoid or the starter is shorted out.

If the fuse blows simply when you turn the key to the ON position, some component or wire is shorted out that leads from (connects to) the "A" (accessory) terminal of the ignition switch. In this case, finding the problem would consist of a matter of elimination...... disconnecting items until the fuse no longer blows.

 

[sully853]

Re: 20 amp fuse keeps blowing

what do i go about disconecting? the wires the connect from the controls to the engine or plugs within the engine itself

 

[Joe Reeves]

Re: 20 amp fuse keeps blowing

Does the fuse blow when the key is simply turned to the ON position, OR does the key need to be turned to the START position in order to have the fuse blow?

 

[tashasdaddy]

Re: 20 amp fuse keeps blowing

disconnect battery, then gain access to ignition switch.

 

[sully853]

Re: 20 amp fuse keeps blowing

the fuse blows when i turn the key one click to the right not to sure but i think it is the on postition.

 

[tashasdaddy]

Re: 20 amp fuse keeps blowing

that is the one position. is there anything connected to the ignition other than just the motor? tach, radio, lights?

 

[sully853]

Re: 20 amp fuse keeps blowing

no nothing at all

 

[Joe Reeves]

Re: 20 amp fuse keeps blowing

What color wires and how many are attached to the "A" terminal of that switch?

 

[sully853]

Re: 20 amp fuse keeps blowing

what switch are you refering to

 

[sully853]

Re: 20 amp fuse keeps blowing

once i use the process of elimination and find the bad plug how do i go about fixing it?

 

[RichardNaugle]

Re: 20 amp fuse keeps blowing

i wanna jump in here as i am having the same or similar problem with a 1972 85 hp only thing that,s different is that my boat will run for 20 secounds everytime i put a new fuse in . whats up?? and there is nothing hooked to the ignition switch except for the power to the choke switch.. sorry to jump in on you but maybe we can work this out together.. thanks rick

 

[Joe Reeves]

Re: 20 amp fuse keeps blowing

Ignition switch..."A" terminal.

 

[djeady]

Re: 20 amp fuse keeps blowing

just solved a similar problem with my 70 HP Evinrude - used a brute force method that's perhaps a little dangerous, but was very effective. I replaced the fuse with a screwdriver bit and check for heat and smoke in the wiring - turned out one wire in the harness had worn through just where the wiring passes through the motor housing - smoked pretty good when it was able to get some real current.

 

[Joe Reeves]

Re: 20 amp fuse keeps blowing

A little dangerous? You're extremely lucky that the short wasn't in the fuel sending unit.

 

[RichardNaugle]

Re: 20 amp fuse keeps blowing

found out mine was a short in the harness for the electric shift going to the bottom end tahnks for the good info on how to go about finding it ....rick

 

[Gillesviolette]

Re: 20 amp fuse keeps blowing

I am in same boat but my fuse does not always blow ! But when I turn ignition to make motor turn over and my motor does not start and I have to turn key again my plug blows ... Is there maybe a specific or should I run the same process of elimination ?

 

[Gillesviolette]

Re: 20 amp fuse keeps blowing

I understand this is an old thread hopefully it pops up on your email but basically what's your saying is disconnect all the wires from the 3/8 nut on my starter solonoid and turn key then undividually connect them to it one at a time till it blows or leave my starter connected and do one wire at a time ? Man I hate electrical problems lol