1999 40 hp Electrical Short?

rvbassseeker

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Purchased a 1999 Fisher Marine 16' Bass rigged boat with 40 hp force engine Labor Day 2007 from an elderly Friend. Engine has performed great every time that it's been in the water until last weekend! With both batteries fully charged, my son and I headed to the lake. While preping boat for the water, I tried to raise engine trim to remove motor support and battery was dead. I then connected motor leads to trollng moter battery and had power to then raise the trim. We then launched the boat, it cranked and run fine for about a half mile then engine started sputtering and died. All efforts to crank were unsuccessful. Appears that engine was getting plenty of fuel to crank because of oil spots in the water, apparently not firing! Got a tow back to launch ramp and headed home. Next day, approx. 24 hrs. later, tried to lower trim, to remove cowl, to find problem. Guess what? Dead trolling battery! Engine leads leading to "whatever is the problem" is apparently draining batteries! Note: Noticed that when I connected motor terminals to charged trolling battery, an arc jumped from positive lead to positive Battery terminal. This means a short somewhere right? Any and all help will be greatly appreciated. By the way, I am electrically and machanically inclined to repair this, I just need you guys experience for help!!! Thanks in advance!!!:)
 

wayne h

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Re: 1999 40 hp Electrical Short?

positive lead should always be hooked up first .. negative last .. i would check your stator for a short and go from there .. a manual with tell u how to preform basic tests with a VOM
 

rvbassseeker

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Re: 1999 40 hp Electrical Short?

Ok, Thanks for the info Wayne H! Checked the stator and it checked out ok according to my ''Seloc'' manual. Have you or anyone else had similar problems? Sorta frustrated! Also checked checked emergency stop switch as well as starter switch! Thanks in advance for all future info provided! Have been a year long lurker and have only now needed assistance from you guys!!
 

wayne h

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Re: 1999 40 hp Electrical Short?

ok lets see here .. i got alittle lost with the trolling motor and engine battery's ..what is hooked to your engine battery .. just the engine or any other accessory's ? could it be that u have bad battery's ? if there is more things on the engine battery i would take them off and see what happens . looks like this might be one of them elimination troubleshooting techniques
 

steelespike

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Re: 1999 40 hp Electrical Short?

I would suspect the bridge rectifier. Otherwise you could pull any fuses see if the short goes away then insert one at a time till it comes back.
 
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