Turning key blows fues

[Bob Tompkins]

On my 1996 115 HP Mercruiser everytime I turn the ignition key it blows the 20 Amp in-line fuse near the starter. The motor goes up and down from the switch on the motor so I know it is getting power. There has to be a short somewhere but I do not know enough about the signal pathe to be able to trace it. Suggestions please? The gauges come on for about two seconds before it blows.

 

[guyjg]

Start looking for it. Begin w/the key switch. Power is distributed by red and purple wires. Check for a wire touching metal. It could even be some corrosion touching ground.

 

[Bob Tompkins]

A couple of points of clarification. The boat started fine a week ago after being stored all winter. I accidentally hooked two small grounds to the positive terminal (not the main ground). I am wondering if this caused the problem and exactly what it could affect.

 

[guyjg]

I accidentally hooked two small grounds to the positive terminal

Oh oh...it's blowing fuses...you fried something...voltage regulator, switchbox, maybe coils...you are going to have to test everything.

 

[Bob Tompkins]

A wire to the fuel gauge melted and shorted. $160.00 house call. Good as new. Thanks for your advice.