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Battery will not charge?

I'm not sure what's happening with it but the first two things I would do is:

1. Take the battery out, charge it, then take it and have it load tested. An alternator will NOT charge a dead or defective battery and could actually be damaged if connected to one. They are expensive but usually not nearly as costly as repairing a charging system.

2. Check your fuses CAREFULLY.
A bad fuse can often look ok and will fool you.

Good luck.
 
We load tested the battery and it was fine. We fully charged the battery and put it back in and it drained the battery within 30 minutes. I could only find three fuses and they all checked out good on my meter.
 
Does it drain the battery while it's just sitting and not running?

Or, does the battery go dead only while it's running?

What year is the outboard?
 
There are 4 fuses listed....
Items 3, 11, 12, and 13 in the parts page link below.


I'm not positive but I believe that the 40 amp fuse (item 3) is the alternator fuse that feeds the rectifier/regulator.

If that fuse is blown and there's no charging, the engine ignition and fuel systems will be running strictly on the battery and will discharge it pretty quickly.

If the fuse is good then you will likely want to see if there is power getting to the rectifier assembly on the white wire.

Since I don't have the shop manual or a wiring diagram, I'm afraid that's as far as I can help you troubleshoot this from here.

Good luck.
 
jgmo said:
There are 4 fuses listed....
Items 3, 11, 12, and 13 in the parts page link below.


I'm not positive but I believe that the 40 amp fuse (item 3) is the alternator fuse that feeds the rectifier/regulator.

If that fuse is blown and there's no charging, the engine ignition and fuel systems will be running strictly on the battery and will discharge it pretty quickly.

If the fuse is good then you will likely want to see if there is power getting to the rectifier assembly on the white wire.

Since I don't have the shop manual or a wiring diagram, I'm afraid that's as far as I can help you troubleshoot this from here.

Good luck.
Click to expand...
Thank you, I will check the fuses
 
No disrespect if you already know this (and you probably do)...
.....If you do find that the fuse is bad and a new fuse blows fairly quickly,
there is a direct short somewhere and you would be wise to not keep running it until that's found and repaired.
I had to say it because some folks are unaware about how shorted wiring can catch fire.

Good luck.
 
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