1980 70 hp charging

[starcraft69a]

Hi guys I am having a problem with charging. I just replaced the rectifier. When not running 11.7v when running 12.5v . Im not sure how to check the stater. Allso when the motor was running just a few min the rectifier got verry warm.
Any help guys?

 

[Will Bark]

Re: 1980 70 hp charging

Make sure both ends of the battery connections are clean and tight; don't just look at them, take them loose and make sure! That's battery end and motor end.

 

[starcraft69a]

Re: 1980 70 hp charging

I have removed them and cleaned them. Both ends

 

[starcraft69a]

Re: 1980 70 hp charging

The voltage was taken at the batt term

 

[Fed]

Re: 1980 70 hp charging

Your battery is a bit flat so your rectifier is working hard to give it the amps it wants.
Try charging the battery up on a battery charger if it worries you then put it back in the boat.
Don't be surprised to see 16-17V charging on a fully charged battery.

 

[boobie]

Re: 1980 70 hp charging

Take the battery to a parts house and have it load tested. It may be bad. You can check the the battery charging side of the stator with an ohmmeter.

 

[starcraft69a]

Re: 1980 70 hp charging

wouldnt my volts go up when motor is running if im checking volt at the batt term cabels coming from motor, even if batt was weak?

 

[Fed]

Re: 1980 70 hp charging

Nope, your charging system hasn't got enough grunt to charge a flat battery at a higher rate, something has to give so your volts drop off until the battery has some more charge in it then the volts will rise.

 

[starcraft69a]

Re: 1980 70 hp charging

ok put a fresh batt in from my rv. same thing volts only went up about one volt. went from 12.1v to 13v

 

[Fed]

Re: 1980 70 hp charging

That's fine it could even go higher as it gets a higher charge in it.
If it's a particularly large battery it may not reach the 16-17 Volts charge I mentioned earlier.
Being an unregulated power supply you need a flooded battery with refillable cells because they can lose a bit of water & need topping up from time to time.
The charging Voltage is governed by the internal resistance of the battery.

 

[starcraft69a]

Re: 1980 70 hp charging

how is it that i use to see my volts at 14v-16v but now it dose not and you are telling me that is working ok. im lost

 

[Will Bark]

Re: 1980 70 hp charging

The longer the engine runs and charges the battery; the higher the voltage should go; these things are more like trickle chargers than battery chargers. If it's showing a positive charge then its working.