Charging Problem ??

[97 See Doooo]

I've read around a little, and dont think I found what I'm looking for yet..

Have a 97 Challenger with 787 . . New battery that reads 11.75 volts NOT running , and 12.05 volts running at idle . . Do the rpm's "have to be" around 5000 to charge, ? or should it charge no matter ?. . little confused as to whats going on , , if something is wrong , should it show "any" differance???
How do you test the stator and or the rectifier??
Any one know any tricks??

Thanks for the help in advance...

 

[glenwhitt]

mine gives the 14.7 out of water idle at 3100 rpm

 

[97 See Doooo]

thanks

thanks that's a start , , , Do you know how to test? and what do I test?

 

[pincusa]

I would say to charge your battery with an external charger and retest. If the battery is low, 11.75 is on the low end, your battery might be going dead

 

[kustomkarl]

You might want to get your battery LOAD tested at like Auto Zone for free. If the battery charges to 12 volts, it could still have a bad cell and not have the amps to start your seadoo properly.

Karl

 

[97 See Doooo]

I would say to charge your battery with an external charger and retest. If the battery is low, 11.75 is on the low end, your battery might be going dead

I actually did do that, and gat the battery up to 12.30 ish . . But again, when I start it, it only goes to about 12.55 ish
why does it go up at all, if something is wrong??

 

[97 See Doooo]

You might want to get your battery LOAD tested at like Auto Zone for free. If the battery charges to 12 volts, it could still have a bad cell and not have the amps to start your seadoo properly.

Karl

Thanks , I will try that too , , But the battery is new , that's why i think there is a problem , but I don't know the procedure for test

 

[kustomkarl]

The regulator rectifier should allow the battery to receive 14.8V+- while running. and you battery should have at least 12.4V+- at rest. The rectifier might be bad, as the regulator keeps the battery from over charging. Check all the wires for a good connection.

I think on that year boat the regulator and rectifier is 1 unit.


Karl

 

[97 See Doooo]

The regulator rectifier should allow the battery to receive 14.8V+- while running. and you battery should have at least 12.4V+- at rest. The rectifier might be bad, as the regulator keeps the battery from over charging. Check all the wires for a good connection.

I think on that year boat the regulator and rectifier is 1 unit.


Karl

Ok , , I will do/try that , thanks

 

[Del Slo]

i was looking at mine as well with a 787, my charging system is doing the exact same thing. according to my wiring diagram it just says "regulator", so like karl said, i think it might be in one unit. cause the three yellow wires and the red and black all go into whats labeled "regulator" what kind of conditons would a bad regulator/rectifier typically give you??

 

[97 See Doooo]

What I found so far , ,

787 Engine
The magneto has a 3 phase, “Y” wound stator on
18 poles. Capacity is 180 watts.
Rectifier/Regulator

787 Engine
A dual 1/2 wave series rectifier receives the magneto
AC current and transforms it into direct current
(DC) to allow battery charging.
"Included in the same unit", a regulator keeps voltage
at a steady level (14.5 to 14.8 volts) to prevent
any damage to components.

So I guess on the 787 , it's all in one..

 

[97 See Doooo]

I also found , like Karl said , that to check for regulator , put a volt meter on the battery while running, and If voltmeter reads over 15 volts, regulator is defective.

Altho not my case . . lol

 

[97 See Doooo]

I did find this tho . .

There should be three yellow wires, and you unplug them , and Check resistance between two of the YELLOW wires. The resistance should be between 0.1 to 1.0 ohm.

Place either meter lead into the remaining YELLOW wire and note the resistance. If the readings are out of specification, the stator will need to be replaced.

And . . . Insert multimeter + lead to one of the YELLOW wires. Ground the multimeter – lead to the engine or the stator iron core and note the reading.
Repeat test with the other two YELLOW wires..

There should be no continuity (infinity) between the stator insulated coils and ground. If there is a reading, the stator coils and/or the wiring
from the coils is grounded and needs to be replaced or repaired.

Not home yet , , so I cant try it , , But I cant wait . .

 

[97 See Doooo]

Too Easy . .

Found the three yellow wires in (the big gray box) along with a red one . .

(I marked them before I pulled them, cuz they are all same , and just in case thay need to stay the same . . lol)

Did the test's , , and all is good . . I dont get it , , ,

So I decided to mount a digital volt gage between the speedo and the RPM gage to keep my eye on things , , (wich i found is handy for when your just bobin and listining to Tunes . . lol)

But what this is now telling me , is when I start the boat , it doesnt go to 14+ volts right of way . . It creeps up , and apparently charging . .

Any thought's on this ? ? ? ?

P.S. the gage fit perfectly between the speedo and RPM , and look's like it belongs there . (handy to have)