18 EC300 Battery not charging

[Tech]

**Regulator/Rectifier is putting out DC voltage...rising & falling w/throttle

**Relay functioning correctly

**Motor & starter running perfectly

**Battery..new AntiGravity 8 cell small case..... runs down after each ride...I sometimes have to kick start. Last ride battery was at 8.6 volts at end of ride.

Possible causes yet to be verified:

#1 Diode at relay - Below is a quote from an old thread indicating it could be the diode attached to the relay.

#2 Loose/faulty connection - I have traced most connections but could have missed something.

Originally Posted by ditezz

I know its an old thread but anyway.The Diode module is used to isolate and protect the two DC supplies ie The stator supply and the Battery supply.
The battery needs to be charged from the Stator.The Diode Module ensures the stator can only flow voltage into the Battery circuit but the battery cannot feed back into the Stator circuit (lights etc).
If you diode Module was missing your battery would not charge which is your Problem.
As for running the motor without the battery can destroy your electronics through over voltage.The battery is ,as well as being a load it acts like a regulator

I am at my wits end...& my wits are old & weak!!

Thanks everyone!!

[blitz11]

Originally Posted by Tech

**Regulator/Rectifier is putting out DC voltage...rising & falling w/throttle

**Relay functioning correctly

**Motor & starter running perfectly

**Battery..new AntiGravity 8 cell small case..... runs down after each ride...I sometimes have to kick start. Last ride battery was at 8.6 volts at end of ride.

Possible causes yet to be verified:

#1 Diode at relay - Below is a quote from an old thread indicating it could be the diode attached to the relay.

#2 Loose/faulty connection - I have traced most connections but could have missed something.



I am at my wits end...& my wits are old & weak!!

Thanks everyone!!

Have you tested the diode? It's not clear from your post.

[Tech]

Have not tested the diode. Not sure how to do this.

I have a Fluke 88V meter.

Also, I am having trouble reading the wiring schematic. I do not understand how the Battery/Relay/Starter schematic interfaces with the rest of the wiring schematic.

[Moto7man]

Caution I saw this video on youtube about testing diodes but I don't know anything about this process, so be careful and use at your own risk.


https://www.youtube.com/watch?v=9LwDPHvzH90

[Moto7man]

PM Member Neil E, he is the electrical guru on this board.

[Tech]

More testing @ diode....view "J" on wiring schematic

**Varying DC voltage on Red wire while bike is running..14.3 max

**Static DC voltage on Red/Yellow wire while bike is running & not running. Same voltage as + - on battery.

**No readings on White/Black or Green/Yellow wires while bike is running or not running

[Neil E.]

Moto7man thanks for the compliment, but I'm not versed on the newer bikes. All I have is the '18 wiring diagram in the owner's manual. It is severely lacking in details. Does not show the stator. Does not show a diode module.

The only diodes I am aware of on the older bikes, are the ones in the voltage rectifier/regulator. The bikes have an AC powered CDI.

I'm super busy right now with no time to investigate. I don't know where to get a proper wiring diagram. The red wire voltage at 14.3 sounds good.

[blitz11]

Originally Posted by Neil E.

Moto7man thanks for the compliment, but I'm not versed on the newer bikes. All I have is the '18 wiring diagram in the owner's manual. It is severely lacking in details. Does not show the stator. Does not show a diode module.

The only diodes I am aware of on the older bikes, are the ones in the voltage rectifier/regulator. The bikes have an AC powered CDI.

I'm super busy right now with no time to investigate. I don't know where to get a proper wiring diagram. The red wire voltage at 14.3 sounds good.

Can someone post that wiring diagram for the year in question?

[Tech]

Diagrams too large to download.

Rieju Linkhttps://static1.squarespace.com/static/5f7ca7769bb53012f2be84b3/t/5f7f666b728d3904359e4333/1602184895623/2021+Rieju+MR+Racing+Owners+Manual.pdf

Pages 15, 16, 17

If that doesn't work try

https://www.rieju-usa.com/downloads

Thx for your help

[Tech]

2018 forward are all the same.