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July 23, 2018, 06:16:37 AM

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electrical problem causing dead battery  (Read 1336 times)
Lunker
**

Posts: 144


 Angry

Something has happened to my boat and I'm getting a dead cranking battery. I have ignition switch/key and a power switch at my dash. When those two are off - nothing in the boat should draw any power. It's been working fine for 5 years and now, I hook up a fully charged brand new battery and then it is completely dead.

Any recommendations on what to check and test to find the problem?

any recommendations for a shop that is great with electrical work that could find the problem?

Please help - I need to get back on the water.

Thanks,
Reggie



Last Edit: June 22, 2016, 08:51:37 PM by reggier
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LLF Fishing Addict
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Posts: 5206


I have a ski boat so my experience may be a little different.  When my key is off, I can still run radio, exhaust fans and lights.  Radio gets me everytime, in fact it got me 2 weekends ago.  Turned on just a smidge.  You sure nothing like that is on and bypassing your switches?



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Lunker
**

Posts: 144


Yeah. The power button is off and turns on/off all the electronics.
I've thought maybe the connection to the power switch could be bad or the ignition switch?

Hoping to hear of a good shop that has the knowledge and tools to test and Locate this problem. 



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I have used powersports unlimited in Princeton for basic oil changes, lower unit changes, and fixing a cracked thermostat housing.....nothing electrical.  Most of the time they were pretty quick. The lower unit fluid change was slow but I did tell them I wasn't going to use the boat for a few weeks.  I store my boat there so I am inclined to take it there since its already there.  I've never had them do any electrical work.



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Minnow
*

Posts: 14


Take a test lamp put it in line between pos.cable and batt.  Pull one fuse at a time till the light goes out. That will point you in the right direction



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Lunker
**

Posts: 144


I'm making some progress!
I've traced this down to the alternator on my engine. It's a Mercury 150 four stroke.
The alternator has a positive cable, but also has another small connector. I'm guessing it's a gauge reader or something.
If it's connected, then the positive connection to the alternator is drawing 2.5 amps without any power. Also, the alternator was very hot after a few minutes of battery power to the engine. If I pull the 'gauge reader' the positive connection doesn't show any amps drawing.

So is the problem the alternator or do I need to keep following this 'gauge reader' connector to figure out what it is?



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