I have a Bafang mid Drive 1000 watt BBSHD. I'm not getting any power to the display. I have 53 volts all the way to the green display plug and still can't get any power to the display. This is the third new display I've tried still nothing can someone please steer me in the right direction?
No power to the display on bbshd Bafang.
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I have a Bafang mid Drive 1000 watt BBSHD. I'm not getting any power to the display. I have 53 volts all the way to the green display plug and still can't get any power to the display. This is the third new display I've tried still nothing can someone please steer me in the right direction?
Chalo
100 TW
This kind of problem is attributable to a plug or a wire the vast majority of the time.
If there's not any obvious damage or anomalies you can see by scrutinizing the cables and plugs, start fiddling with the plugs while they're all plugged in and the battery is attached, to see if it will show signs of life.
If there's not any obvious damage or anomalies you can see by scrutinizing the cables and plugs, start fiddling with the plugs while they're all plugged in and the battery is attached, to see if it will show signs of life.
It stopped working out of the blue. Stop writing it one day then went to go ride it two days later and it would not power up. It's a 1000 watt the thing mid Drive with a DPC 18 display. The plugs were only plugged in one way and it has 53 volts all the way to the plug that plugs in the controller. Thoughts?
Chalo
100 TW
You haven't exonerated the controller plug itself.
Also the controller could be bad; it happens.
docw009
10 MW
You measure 53V all the way to the plug on the handlebar harness? Those are male pins, as you know, and a bitch to measure unless you have jumper wires.
Displays are stand alone. All they need is battery power on pos/neg to power up,
You mihht have bent pins or something mechanical,
Displays are stand alone. All they need is battery power on pos/neg to power up,
You mihht have bent pins or something mechanical,
Yeah I've used jumper wires. The only thing I have plugged in is the Speedo table, throttle and display. The motor is putting out 4.67 volts alone no battery is that correct or should it be putting out more
Chalo
100 TW
It's premature for that. Because the symptom you specify is the display won't come on, you should figure out whether you have power on the pins to the display. Probably there should be a battery voltage pin and a low voltage pin (relative to ground). I'm not familiar with the details of the controller and display you're using.
P+ and PL jumpered will turn on the controller. You could try that to see if it works.
Troubleshooting the BBSHD / BBS02 - Electricbike.com Ebike Forum
This is troubleshooting a BBSHD/BBS02 <br><br> If you are having issues but the motor is still running please select one of the 2 following links: <br> BBSHD Troubleshooting Random issues on unit still moving (https://electricbike.com/forum/forum/knowledge-base/motors-and-kits/bbshd/8318-bbshd
electricbike.com
Chalo
100 TW
No, that shows you have battery voltage at the display. But the display likely doesn't run on battery voltage, and that may only be for measurement purposes. Try to find 5V or 12V on one of the pins from the controller. Maybe sometime who understands that specific family of controllers can say what voltage it uses for operation.
Docw009 provided the pinouts in his post above. No need to guess. If you can turn on the controller by jumpering P+ and PL, then at least you know the controller is functioning. The display only needs P+ (battery +) and ground to turn on. The other conductors are transmit, receive, and PL, that turns on the controller when the display directs battery level voltage back to the controller to turn on. You checked for battery level voltage on the connector, but did you check for ground?
Chalo
100 TW
I didn't see that, it's very helpful. But I don't understand what "PL" means in the pinouts.
I apologize I got my words crossed I do not mean to say control or I meant to say the display is the problem. I have 58 volts on the Battery and the Motor. Then going up the main harness first connection has 53 volts then 53v at the display plug.Then no power to the display.
I think I read it on the Luna website, but have to check what the L refers to.
This was a good video on turning on the display without connecting it to the controller. Showing only ground and battery + is needed. That's an easy way to test the display (different display, but Bafang UART).
Jumpering P+ and PL on the controller connector is an easy way to test the controller.
docw009
10 MW
The display should power up. It runs off battery voltage on P+ and ground, THat's all it needs.
There is one more possibility. I remember a poster with this problem. The clue is you measure 58V at the battery and 53V at P+. No way, Electrically, it's all copper between the battery positive input and P+. Same between the motor negative and ground. Both are straight shots. Shouldn't have voltage drop unless the lines are corroded somehwere. If it drops 4 volts with a meter, it probably drops 40V with the display, Display can't get enough volatge to turn on,
Disconnect the battery, Let the controller discharge, DIsconnect the display. Measure the resistance between the negative pin on the motor and the ground pin on the connector, Do the same between the positive pin on the motor and P+ on the connectir, Bith shoukld be zero ohms or close to it,
There is one more possibility. I remember a poster with this problem. The clue is you measure 58V at the battery and 53V at P+. No way, Electrically, it's all copper between the battery positive input and P+. Same between the motor negative and ground. Both are straight shots. Shouldn't have voltage drop unless the lines are corroded somehwere. If it drops 4 volts with a meter, it probably drops 40V with the display, Display can't get enough volatge to turn on,
Disconnect the battery, Let the controller discharge, DIsconnect the display. Measure the resistance between the negative pin on the motor and the ground pin on the connector, Do the same between the positive pin on the motor and P+ on the connectir, Bith shoukld be zero ohms or close to it,
No I have not and I'm not really sure how to do that. This is my first electric and I've always been a hot rod guy and electrical is my very weakest area of expertise. I guess I really just need to know how to check the whole system
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