New battery discharged after use every time. HELP!

[Gunvm]

Does anyone kows whats goin on? I really dont know but i have buyed 2 batteries in one month.

I went to the lake and used the jetboat like 5 hours with the last new battery, and finally when i stop using the boat the battery just dies.. Its my second bat in one month.. Whats happening?

 

[BMANN06]

Something is drawing current is your bilge pump switch on?

 

[BMANN06]

Something is drawing current is your bilge pump switch on? Put a multimeter across battery terminals while boat is running (dc volts) you should see a reading around 14Vdc if it's 12v or lower your charging system has issues. Mag/rectifier etc.

 

[Dr Honda]

The easy way to find it is.... Put an amp meter on the battery cable, and then start pulling fuses until the draw goes away.

 

[Gunvm]

Ok folks, ill do it during the evening today, i will check the bat with the jet running and use the multimeter...

Depending on the results i will post them, and later i will try checking the fuses...

 

[Gunvm]

The easy way to find it is.... Put an amp meter on the battery cable, and then start pulling fuses until the draw goes away.

How is this process? Red wire of amp meter to bat or how?

 

[BMANN06]

How is this process? Red wire of amp meter to bat or how?

If you have an ammmeter put it around red battery wire. If you only have a mulitmeter, remove the red probe and stick it in the mA terminal. Then switch your multimeter to mA. Then remove either the black battery lead or red battery lead. Touch one of the multimeter leads to the battery post that you removed the cable from, and the other lead to the wire that you disconnected.

Here is an article thats better than my terrible description.

http://www.youtube.com/watch?v=MNzZSsuQthY

 

[Gunvm]

Something is drawing current is your bilge pump switch on? Put a multimeter across battery terminals while boat is running (dc volts) you should see a reading around 14Vdc if it's 12v or lower your charging system has issues. Mag/rectifier etc.

I make the test and when it was on the jet it was displaying 12.20 v with a new gel battery special for marine boats.

What is next?

 

[BMANN06]

I make the test and when it was on the jet it was displaying 12.20 v with a new gel battery special for marine boats.

What is next?

Does your speedster have twin engines? Your avatar just states 2004 speedster? Theres a few flavours.

You have an electrical problem, all the batteries you've replaced are just fine. Something in your electrical system is not allowing them to charge. This could be caused by:

1. Faulty Rectifier
2. Faulty Magneto
3. Faulty Cabling

The reason I asked about your specifics on boat model is that some of the speedsters have superchargers. The washers on the superchargers for the 2004 years are ceramic and break apart. I have a magneto cover that experienced this issue and a piece of the washer chewed the actual magneto up causing your symptoms. I'm not saying this is your issue but its a possibility.

First inspect your wiring. You'll see a connector right beside the ECU it has 3 yellow wires, check that the wires aren't burnt at the connector. The rectifier is fastened to the air intake box have you'll see the same 3 yellow wires. Inspect the wires at these connectors aswell.

Second see if you have AC voltage. Each of the three yellow wires is an AC phase. So that connector by your ECU, unplug it, put your multimeter in AC voltage and check for AC voltage across all three wires (the wires that go into the engine). Positive lead on multimeter to one phase, negative or black multimeter lead to a common ground. I think you should see around 5VAC on each of the phases while the engine is running (idle), the AC voltage will go up as RPMs increase. Do this test, if you see AC voltage on all three. Its your rectifier, replace it. If you see no AC voltage ... time to pull magneto cover and see whats up with MAG itself.

hope this helps!

 

[Gunvm]

Its a twin rotax..

 

[BMANN06]

Did you do the battery voltage test with both engines running at idle? Since you have two engines you have two charging systems, I find it kinda of odd that both of them quit on you. Is your boat in the lake? If so do the battery voltage test with both engines running, get a voltage reading Post it back. Then do voltage reading with Port Engine running Post results. Then with Starboard engine running post back the results of each test.

 

[Gunvm]

Did you do the battery voltage test with both engines running at idle? Since you have two engines you have two charging systems, I find it kinda of odd that both of them quit on you. Is your boat in the lake? If so do the battery voltage test with both engines running, get a voltage reading Post it back. Then do voltage reading with Port Engine running Post results. Then with Starboard engine running post back the results of each test.

Ok i will go to the lake today, i will test as u describe.

What do u mean port engine test?

And starboard test?

 

[Gunvm]

Did you do the battery voltage test with both engines running at idle? Since you have two engines you have two charging systems, I find it kinda of odd that both of them quit on you. Is your boat in the lake? If so do the battery voltage test with both engines running, get a voltage reading Post it back. Then do voltage reading with Port Engine running Post results. Then with Starboard engine running post back the results of each test.

I returned from lake and the new gel bat was discharged using it for two hours, i make the test while it was working fine and the result was 11.40v... Im getting tired of this problem.. 3 discarged new bats in the last 3weeks.. I'm thinking the problem is as u say.. But i dont know how to detect if it is the rectifier.

 

[BMANN06]

On each engine is a magneto and a rectifier. The magneto generates AC current and the rectifier converts AC current into DC current that you battery can use (it also regulates the voltage to 14.5V). If your having a hard time locating these components you may want to take the boat to any starter rebuild shop or alternator rebuild shop. They will be able to easily diagnose which components are defective. I'm still finding it quite strange that both charging systems have failed. If you can take a picture of the engines bay from the back bench, I can edit the picture and show you where the components are and how to test them with your multimeter. (I wold take a picture of mine to show you but its winterized and shrinkwrapped ... boooo!!)

 

[Gunvm]

On each engine is a magneto and a rectifier. The magneto generates AC current and the rectifier converts AC current into DC current that you battery can use (it also regulates the voltage to 14.5V). If your having a hard time locating these components you may want to take the boat to any starter rebuild shop or alternator rebuild shop. They will be able to easily diagnose which components are defective. I'm still finding it quite strange that both charging systems have failed. If you can take a picture of the engines bay from the back bench, I can edit the picture and show you where the components are and how to test them with your multimeter. (I wold take a picture of mine to show you but its winterized and shrinkwrapped ... boooo!!)

Ok, 2morrow i will atach a pic.... Also let me tell u that i found the connector of the 3 yellow wires... Tomorrow i will make the test with the multimeter and check if there is variation. Hope u can help me but in my multimeter what should i select ? Voltage? Amp? Resistence? I think its voltage grade 20. Is that correct?

Also when i make this test, the boat has to be running i guess? And i should check the connector puttin the multimeters black wire at ground and red to each hole?

 

[BMANN06]

To test the output of the mag, put your meter in AC Volts, your meter may have a symbol like this ~, it really would be best for us to have a picture to work with. If you can get that we might be able to figure this out.

 

[Gunvm]

To test the output of the mag, put your meter in AC Volts, your meter may have a symbol like this ~, it really would be best for us to have a picture to work with. If you can get that we might be able to figure this out.

ok buddy i take a pic of the multimeter, and some of the engine bay and some of what i think its the 3 yellow wire component.
but i cant post them, it says error when i tried to upload.. send me your email here or email me gdvm84@gmail.com so i can send u back the pics

 

[BMANN06]

PM sent with email address

 

[Gunvm]

PM sent with email address

Done.. Check ur email

 

[BMANN06]

Okay got the pics, I kinda suspected this. You've got some burnt conductors these will need to be replaced. We'll do this one test at a time. Lets start by testing the output of the Magneto. First put your meter in this position. This is AC Volts.

Do this test on each engine while running at idle. (it's best to do this test while the boat is tied to a dock to ensure proper cooling). Now probe any two of the 3 pins in this picture (red meter lead on one pin, black meter lead on another pin). Write down the results and then do the same test across the other pin (write down the results) and post them here.

Again do this test on each engine, and the engine your testing MUST be running. Let us know what the results of this test are and we'll move to the next set of tests (pending results of this one).

b

 

[Gunvm]

I make the test to each engine... The result in every pin was rounding bout 22.1 to 23. I make it without idling, just with each engine on.

Does this results are ok? Or i have to do another thing?

 

[BMANN06]

Cool, okay now plug that connector back in. And do the same test at the other end of the cable, as in unplug the 3 yellow wire connector at the Rectifier end and do the same test. What were doing is the cable test. Just make sure you proble the cable that goes back to the magneto. I think your going to find your conductors (wires) are the problem. You should see the same 22-23Volts AC at the cable going into the rectifier. I realize this seems redundant but if we do it one test at a time, its less confusing and easier to isolate the problem. Post back the results of this test.

 

[Gunvm]

Cool, okay now plug that connector back in. And do the same test at the other end of the cable, as in unplug the 3 yellow wire connector at the Rectifier end and do the same test. What were doing is the cable test. Just make sure you proble the cable that goes back to the magneto. I think your going to find your conductors (wires) are the problem. You should see the same 22-23Volts AC at the cable going into the rectifier. I realize this seems redundant but if we do it one test at a time, its less confusing and easier to isolate the problem. Post back the results of this test.

Ok... Where is the 3 yellow wire of the rectifier? ( its near the ECU i guess ? )

 

[BMANN06]

Nope, hold on I'll get you a pic.

 

[BMANN06]

Plug the 3 wire connector back in at the ECU, then unplug it at the rectifier see pic. You want to test the pins that go back to the magneto.