Battery is not charging. Where to start.

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mattzmojo

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Feb 21, 2012
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I have a 1972 50 HP evinrude electric start motor. It runs fine but I have to charge my battery every time I come back. I am ok with that but thought I would see if I could figure out what is wrong. I tested the stator coil using my Ohm meter and it tested fine. What other parts can I test? I read that I need a DVA adapter to read the peak voltage. Is this true? and if so, am I actually testing this while running?

Where do I get an inexpensive DVA meter?
 
B

boobie

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Nov 5, 2009
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20,826
Re: Battery is not charging. Where to start.

Sounds like a bad rectifier. Is the battery hooked up correctly ??
 
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mattzmojo

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Feb 21, 2012
Messages
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Re: Battery is not charging. Where to start.

The battery is hooked up correctly. Nice tight connections. I tested the rectifier per instructions I found in the manual I have and it seems to be fine. Each wire coming out has some resistance only in one direction to ground.
 
H

hidef

Lieutenant
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Aug 22, 2009
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1,465
Re: Battery is not charging. Where to start.

Did you check the red to yellow wires?
 
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mattzmojo

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Feb 21, 2012
Messages
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Re: Battery is not charging. Where to start.

It looks like its the stator. I tested the stator winding using my trusty service manual and it seems to have a ground(y ellow wires coming from stator) when checking on the higher ohms scale.
 
M

mattzmojo

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Feb 21, 2012
Messages
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Re: Battery is not charging. Where to start.

mattzmojo said:
It looks like its the stator. I tested the stator winding using my trusty service manual and it seems to have a ground(y ellow wires coming from stator) when checking on the higher ohms scale.
Click to expand...
Does anyone know what years span the stator? I guess I need to keep a look out for a used one.
 
M

mattzmojo

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Feb 21, 2012
Messages
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Re: Battery is not charging. Where to start.

Ok Completely PUzzled now.

The stator was bad. I had high ohms reading to ground, in essence the stator coils were grounded.

I ran tests on the rectifier and each lead showed continuity only in one direction. I tested the new stator that I put in and it was not grounded and the stator coil reads 1.6ohms which is normal(NORMAL IS 1.5 +/-.5 Ohms).

When I do an Alternator output check per the manual which involves running the motor and testing for voltage between ground and either terminal 1 and/or 2 (the stator coil leads) I only get 6Volts where I should get 12Volts. HUH?

What am I missing?
 
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