I have a radrover5 with updated 750w bafang motor purchased 1yr. ago. Everything working fine until a week ago. Power would cut out, turned bike off and back on and it would work again until it finally quit. Replaced controller and wire harness plus new battery holder. Still having problems. Thought it could be motor cable but when unplugged still having same problems. Also have 2 batteries and both do the same thing
Electrical problem
- Thread starter tdinges25
- Start date
indianajo
Well-Known Member
You need to use a meter to measure the battery voltage going into the controller continuously. I have skinned a little insulation off the wires, not at the same point so there would be no short. Then use alligator clips with rubber boots. Could be a connector, could be a battery, could be downstream in the controller or an accessory. If battery voltage is above minimum at all times it is down stream. A holder to make a multimeter visible at all times is required.
A throttle with a voltage indicator built in can be useful. These read a separate power wire from the battery, usually to a female .157" bullet socket. I usually pick up the +48 from an alarm power connector.
I have my suspicions of patented push in battery connectors. I use wires to an XT90 on my battery, now replaced by Dorman insulated crimp flag terminals since the XT90 I soldered to the controller wires fell off. 6 years, 12000 miles, I never lose power unless the battery is actually run down by too many miles+hills. My battery is held in place by aluminum angle, machine screws and elastic stop nuts. 22 of them so nobody has successfully stolen the battery while I was shopping. 2 attempts.
A throttle with a voltage indicator built in can be useful. These read a separate power wire from the battery, usually to a female .157" bullet socket. I usually pick up the +48 from an alarm power connector.
I have my suspicions of patented push in battery connectors. I use wires to an XT90 on my battery, now replaced by Dorman insulated crimp flag terminals since the XT90 I soldered to the controller wires fell off. 6 years, 12000 miles, I never lose power unless the battery is actually run down by too many miles+hills. My battery is held in place by aluminum angle, machine screws and elastic stop nuts. 22 of them so nobody has successfully stolen the battery while I was shopping. 2 attempts.
harryS
Well-Known Member
Only thing left to replace is the display, and it probably is the culprit if you have a new controller and handlebar harness.
The display powers up off a battery +/- in the handlebar harness. It turns off if that power is interrupted, or if the voltage drops too low (about 40V in a 48V system). There's no other voltage from the controller to power it. It has it own power supply to run the display, A bad connector pn the display might be the issue, or a bad circuit component inside the displat.
Anyway, probably not expensive.
The display powers up off a battery +/- in the handlebar harness. It turns off if that power is interrupted, or if the voltage drops too low (about 40V in a 48V system). There's no other voltage from the controller to power it. It has it own power supply to run the display, A bad connector pn the display might be the issue, or a bad circuit component inside the displat.
Anyway, probably not expensive.
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