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Author Topic:   Charging System Problems
SailorDave17 posted 06-28-2009 03:46 PM ET (US)   Profile for SailorDave17   Send Email to SailorDave17  
I have a 1987 Outrage 18' it has a 150 yamaha 2 stroke 1989? I have been running into the problem of a dead battery more often than not. I do keep the boat in the water during the summer months and do not have shore power at the dock. I am aware that this will put a drain on the battery, but How much charge should be put on that battery while the boat is running? Give you an example, last weekend the battery was pretty low, not enough to turn the motor fast enough to start, but plenty to run any other accesory. I jumed the battery I ran the boat recreationaly for the next 2 days. I would have thought this would have been enough to charge the battery back up. I did not run use the boat that following week, we only had one night of rain. And on friday the battery did not have enough to turn the motor fast enough to fire. I did take the battery home tis weekend, tested and charged it, it took the charge. I am suprised that it did, so the battery does not seem to be the problem. Should my charging system be generating more power, or is this the norm?
jimh posted 06-28-2009 04:29 PM ET (US)     Profile for jimh  Send Email to jimh     
It is not possible to make an assessment of the charging system on your boat with the data provided. We need to know with accuracy the battery terminal voltage when the motor is operating at more than 1,500-RPM.
SailorDave17 posted 06-28-2009 04:35 PM ET (US)     Profile for SailorDave17  Send Email to SailorDave17     
Im sorry i forgot to mention that, I took a reading at about 3400RPM and it was reading 13.2, what do you think?
SailorDave17 posted 06-28-2009 04:38 PM ET (US)     Profile for SailorDave17  Send Email to SailorDave17     
The more i think about it, i want to say that was a little closer to 3200RPM.
jimh posted 06-28-2009 08:06 PM ET (US)     Profile for jimh  Send Email to jimh     
A battery terminal voltage of 13.2-volts during charging is not particularly indicative of much charging activity. If a battery is being charged its terminal voltage should be higher.

There are three elements to your problem:

--is the engine charging the battery? You need to examine the engine's battery charging circuit to see if it provides any real charging current.

--is the battery in proper condition? Can the battery accept and hold a charge? In any battery operated system the first component to test is the battery.

--is there any parasitic drain on the battery in the boat? Even a small parasitic drain on the battery will pull off a substantial charge over a long time.

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