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[PVNRG]

Turned on the key switch today and a second later the dash and everything went dark. Took off the battery case plugs and there are no lights lit. Anyone have any advise?

[PVNRG]

OK, so I tried the BMS reset. Software button press for a few seconds and release did nothing. Hardware reset press for a few seconds and release, and now..., the light #4 is now blinking green showing "Healthy", hurray!!

Turns out the 3.15A fuse is blown. Anyone have any idea why this would happen? I'm going to get another one (or few) but usually if a fuse blows it is because something was pulling too much current.

[PVNRG]

Also, I'm having trouble finding the 3.15A fuse part number. Does anyone have it handy?

[PVNRG]

Silly me, it is written on the fuse of course. T3.15AH

[TEV]

This is what you need:

https://www.amazon.com/dp/B07D311HXB/ref=cm_sw_r_cp_apa_i_MxVoFbEGSDB5Y

Good luck.

Tom

[PVNRG]

Thanks!!

Has anyone had to replace this fuse before? If so, what was causing it to blow?

[PVNRG]

Got the new fuse, put it in and heard something. Pulled fuse back out and it is blown. Now what? First guess is perhaps the contactor contacts are welded together? Maybe the DC/DC converter fried? Hmm. Has anyone had that 3.15A fuse blow?

[PVNRG]

Just checked voltage on the DC terminals of the motor controller and there is no voltage, so it seems that the contactor is not welded shut.

All BMS lights are dark again.

Hmmm

[Auriga]

This failure can be caused by a defective DCDC. It can blow the low power b+ and damage the mbb and bms. I'd disconnect the DCDC, replace the fuse, and see if your bike comes back online without the dash backlight/lights.

Otherwise, you're probably looking at an expensive repair bill

[PVNRG]

I pulled out the 3.1A fuse on the battery, the 4A fuse for MBB, the 1A fuse for I don't know what, and all the 12V fuses. Removed the DC/DC converter connector from it. Now the 3.1A fuse holds with both the 4A MBB fuse and the 1A fuse installed. Battery 4th LED blinking normally. Seems like the DC/DC may have fried or maybe the MBB. There is battery voltage on the DC/DC converter connector as measured when unplugged. Looks like a bear to get the DC/DC converter out. I installed the 2.5kW charge tank back in 2016 so that is in the way too. Next I think I will plug the DC/DC converter back in and test for 12V at the fuse block.

Interesting that the 1.3kW charger fried a couple of week ago and now these other problems have happened. Hopefully the MBB is OK!!

Let me know if you have any more ideas on this.

Thanks!!

[PVNRG]

I tested the DC/DC converter. Removed the MBB connectors. Jumpered the B+ and Enable on the DC/DC converter. Inserted the 3.1A fuse and it blew immediately. All signs point to DC/DC converter failure. I guess the next test would be to hook it up to an external power supply for final 100% confirmation that it is fried.

Will the MBB communicate via UART without power from the DC/DC converter? I sure hope it can't because I can't connect to it now with everything back to normal except for having the DC/DC converter disconnected. Help please?? Thanks

[TEV]

With the dc/dc converter disconnected,  if everything else is ok, the bike should run, you just won't have the dash, lights,  horn, turn signals, basically anything that needs the 12V, but, again,  the bike should run.

[TEV]

BTW, you should mention the year and the model.

[PVNRG]

Thanks TEV. I assumed that my signature would give the information. DSR 2016

Thanks!!

[Auriga]

That's correct. The MBB should be functional even with the DCDC removed. It could still be the MBB or the BMS or both. The BMS's power supply circuitry can be damaged without showing on the lights, and the MBB could be dead as well.


Next I'd disconnect the 34 way MBB connector from the MBB and see if I could measure pack voltage on pin 18 and 7 with the key on. If you cannot,, then the BMS is toast. And the MBB could be too. Note the fuse needs to be plugged in and not blown.

Looking directly at the connector, pins 1-17 are the top row and 18-34 are the bottom. Be very careful not to damage pins measuring it with blunt multi meter probes.