New Battery Losing Charge

[Simmo2]

Didnt 'we' just say all this in post 21?
Without that info, we are just goin round in circles.

[FNQCairns]

Hi FNQCairns, 13.8 to 14.7 is the correct charging voltage range for automotive and marine batteries.

Any lower and the battery will not fully charge and may not charge at all.

Any higher and the battery will be cooked and most AGM and Gel Cell batteries have a maximum recommended charging voltage of 14.4.

Cheers

Yeah thanks driveon, yeah you are right but not many batterys will maintain a full charge in use outside of laboratory conditions, I am happy if a lead acid I buy holds 90% of its specified rating after 10 trips and unregulated outboards can see up to almost 16V as normal not nice but it is common.

So at cruise depending on what the individual considers cruise speed 13.5 to 15.5 will show that the charging side is ok for but I would hope a cleanup of wire contacts would deal with the lower number here, if it didn't raise to 14V or more above 3500rpm I would do some more checking.

cheers fnq

[station-rat]

Splash
You should have 2 diagrams in your e-mail account
Station-rat

[Splash]

An itneresting thread - glad for all your input thus far...

OK - Here's the deal - I was abel to keep the multimeter over the weekend :-)

I will run boat tomorrow with the multimater on board and test voltage.


Will battery lose charge if sitting for a week at home with both leads (to motor) still attahced?

SPlash

[station-rat]

Any battery will loose charge just sitting, not even connected to motor.
It all depends on condition of battery,temp,what the battery is sitting on,how clean the top is, allsorts of things.But a good battery will still hold enough charge to start a motor after 2 months. I would suspect the problem to be the battery is not being charged while the motor is running
Station-rat

[Splash]

Splash
You should have 2 diagrams in your e-mail account
Station-rat

SRAT - emal sent back.

Unable to open and view pictures for some reason...

THoughts?

Splash

[station-rat]

Sent as BMP ---see if that works for you
Station-rat

[Splash]

Thanks SRAT - goth em. Works good now.

Big weekend coming up - and will let you all know of outcomes..

Splash

[Splash]

AS some of you know, I have had dramas thi sweekedn and have not been able to hit the water for test.

Can I still test for battery charging, whislt running at home?

SPlash

[station-rat]

Splash
You can check battery voltage before you startup, and then again when it is running (I would not run it much above 1200rpm on muffs) You should see a voltage increase, about the voltage before starting.
Station-rat

[Splash]

Splash
You can check battery voltage before you startup, and then again when it is running (I would not run it much above 1200rpm on muffs) You should see a voltage increase, about the voltage before starting.
Station-rat

OK - I'll try. I know FNQ mentioned I need to do above 3500RPM - but probably unlikely on muffs.

Stand by.

I'll also try rectifier test.

SPlash

[Splash]

Just ran it at 1400RPM - no vlotage change - 12.97V.

I did not want to run it any higher - I will re- test next weekend now..

SPlash

[station-rat]

Think it might be time to check the restance of the coil in the flywheel and the rectifier.When you look under the flywheel is there any black goo dripping from the coils in the flywheel???
Station-rat

[Splash]

Is there any special way I have to put the flywheel back after I remove?

SPlash

[station-rat]

You do not have to remove it yet!
Just look under the flywheel for the black goo and test the resistance of the coils
Station-rat