Is there a way to reverse the polarity to the light bulbs without 'blowing up' the system? I wish to use regular LED light bulbs.
I have this generic Chinese scooter with 48v 500 watt controller with 3 speed and reverse, no cruise control. There is a dc/dc converter similar to your 36-72 Volt DC to 12 Volt DC 10A Converter.
I wanted to replace incandescent bulbs with LED bulbs. When LED bulbs didn't light, I found that the polarity was reversed. I would have switched wires to the socket, but is impossible with dual filament bulbs.
I purchased bulbs with circuitry to handle reverse polarity, and it worked. I am using these bulbs in the dual intensity head lamp, and the brake/tail lights.
I have found that these special LED bulbs are affecting the system in weird ways: 1) When riding at night, and I squeeze the brake several times rapidly, a signal is sent to the controller to stop the motor! A simple on/off of the main power switch restores power to the motor. 2) I wanted to add a brake light for safety, like in cars. I tapped into the brake wire at one of the tail light sockets, which seemed to work until I turned on the running lights, which also lit the new brake light. I attached a volt meter to my new brake light wire, and there is 12v when the brake lever is pulled, but if I turn the running lights on, 9.5v is detected! This same weird reaction happened when I switched the wire to the tail light.
If the non polarity bulbs are removed (no bulbs) or replaced with the original incandescent bulbs, the voltages are correct: 12v is detected on the brake wire only when the brake is pulled, and 12v is detected on the tail light wire only when the lights are switched on. I am just pointing out my findings of the use of non-polarity LED bulbs.
It was not my intention to focus on the adverse effects of non-polarity LED bulbs.
The standard polarity, adhered to in most vehicle lighting today, is a positive charge applied to the contacts at the bottom of a bulb, and the negative, or common, wire applied to the outside casing of the bulb. Imagine this while looking at a 1157 type bulb. My situation is opposite from this standard.
The question I ask is: Can I safely modify the wiring to match the standard polarity for the lights without harming the controller?
I am not very familiar with controllers, and my knowledge of electronics is not too technical. I have looked at the wiring diagrams you list with your controllers, and there is no mention of lighting.
Please let me know if I missed a question, or if you have any further questions.