60 HP Mariner ELPTO No Charge With New Rectifier and Stator Seems fine...

[troy102485]

Hello All,
My appoligies if this is posted twice, but I can't seem to find my original posting.

My mariner which is an early 90's model, serial # 0d 060583 won't charge the battery.
I ran through some tests from the service manual and the rectifier was tested as faulty, The Stator read 1ohm, and no short to ground.
I changed the rectifier and tried again, Still not charging. The output of the rectifier is equal to the battery voltage, and 0 current going to the battery.

I attached the multimeter to the output of the stator while running at idle and I recieved 60v AC. Increasing the engine RPMS increased the voltage up to 100V AC. Which to me seems reasonable for a stator output.

So confused I removed the new rectifier to verify it's operation and it checked out fine.
So I'm completely lost! Seeing that kind of voltage at the stator output and having a new rectifier, what could be the problem???

 

[schematic]

Re: 60 HP Mariner ELPTO No Charge With New Rectifier and Stator Seems fine...

The output of the rectifier is equal to the battery voltage, and 0 current going to the battery.

The output of the rectifier and battery voltage will be equal. They are connected together. How have you confirmed 0 amps charge current?


If the battery "state of charge" is low, the voltage will remain low until it has been charged for some time....

 

[troy102485]

Re: 60 HP Mariner ELPTO No Charge With New Rectifier and Stator Seems fine...

Sorry I wasn't clear when I stated battery and rectifier voltages are equal, I meant the voltage when running the engine is the same when the engine is off. No increase. 12.5 volts. I measured the current by disconnecting the wire from the rectifier that goes to the battery and place a fluke multi meter inline.

 

[schematic]

Re: 60 HP Mariner ELPTO No Charge With New Rectifier and Stator Seems fine...

It is possible that the resistance test of the stator is misleading. Meters don't supply much current when testing ohms. Try testing the stator for continuity with a battery powered test light, or connect 12v to the stator leads with a headlight bulb hooked in series. If the bulb lights, the stator continuity is OK.

Another question also arises.....how are you connecting to the rectifier?

Have you measured the voltage at the rectifier output stud while running?

 

[troy102485]

Re: 60 HP Mariner ELPTO No Charge With New Rectifier and Stator Seems fine...

The voltage at the output of the rectifier stud is 12.5v... This is while running. Everything wired normally.
When I reinstalled the new stator I wired everything up the same as the old one.

I'll retest the stator as you suggested. However there is 60v ac coming from the stator running the engine at idle. Does this not indicated a working stator?

 

[schematic]

Re: 60 HP Mariner ELPTO No Charge With New Rectifier and Stator Seems fine...

However there is 60v ac coming from the stator running the engine at idle. Does this not indicated a working stator?

Not necessarily. A bad connection can pass enough current for a voltage reading and not allow much current for charging (thus the headlight test).

What is the ac reading when connected and running?

 

[Fed]

Re: 60 HP Mariner ELPTO No Charge With New Rectifier and Stator Seems fine...

The voltage at the output of the rectifier stud is 12.5v... This is while running.

Where did you put the negative meter probe?
You need to be very aware of exactly where you are testing especially with ground connections as they form an equally important part of the circuit.
If you're getting 60V AC right at the rectifier but only static battery voltage DC right at the rectifier then it has to be faulty.
A somewhat flat battery can cause a low reading too but you would have to be very unlucky not to see some sort of change from stationary to running.

 

[MH Hawker]

Re: 60 HP Mariner ELPTO No Charge With New Rectifier and Stator Seems fine...

One important thing, At idle it dosnt do much if any charging. Hook a volt meter across the battery terminals and take it for a ride, then you will know if its charging or not. If it isn't then hook them to the two stator wires and set the meter to AC and see what it says. you should have 13 to 16 DC volts at the battery and 13 to 17 AC at the stator. Its that simple.

 

[troy102485]

Re: 60 HP Mariner ELPTO No Charge With New Rectifier and Stator Seems fine...

Not necessarily. A bad connection can pass enough current for a voltage reading and not allow much current for charging (thus the headlight test).

What is the ac reading when connected and running?

Headlight test passed. Ac Reading while connected and running is approximately 60vac at idle. and 100vac when I increase the rpm

 

[troy102485]

Re: 60 HP Mariner ELPTO No Charge With New Rectifier and Stator Seems fine...

Where did you put the negative meter probe?
You need to be very aware of exactly where you are testing especially with ground connections as they form an equally important part of the circuit.
If you're getting 60V AC right at the rectifier but only static battery voltage DC right at the rectifier then it has to be faulty.
A somewhat flat battery can cause a low reading too but you would have to be very unlucky not to see some sort of change from stationary to running.

I connected the negative meter probe on a clean ground connection while testing the DC voltage. AC voltages I measured directly on the stator, both leads on the stator wires.
Thanks.

 

[troy102485]

Re: 60 HP Mariner ELPTO No Charge With New Rectifier and Stator Seems fine...

One important thing, At idle it dosnt do much if any charging. Hook a volt meter across the battery terminals and take it for a ride, then you will know if its charging or not. If it isn't then hook them to the two stator wires and set the meter to AC and see what it says. you should have 13 to 16 DC volts at the battery and 13 to 17 AC at the stator. Its that simple.

I have a Fishfinder with a voltage reading, while running it last weekend the voltage was reading low. below 12v. I haven't had it out with the new rectifier, however I ran up the RPM of the engine and the ac voltage went up to 100v...and the DC voltage stayed at 12.
I was going to take the boat out this weekend, so I'll double check, but in the meantime I'll remove the rectifier and bring it to work to test it again. I'll apply an ac voltage and check the output.
Thanks for the help.

 

[schematic]

Re: 60 HP Mariner ELPTO No Charge With New Rectifier and Stator Seems fine...

I ran up the RPM of the engine and the ac voltage went up to 100v...and the DC voltage stayed at 12.

Thanks for the help.

either its wired wrong or rectifier is bad......


Is this a rectifier or regulator?