I have a Merida 550 that I would like to modify with a couple of switches to override the stock controller. At one point, a webpage with information about a 'turbo' button and a 'kill' switch was posted on a page put up by chas_stevenson. I can still find the links, but the page was on a server ('Hometown'?) that is no longer avaialable.
The kill switch I can do by splicing into the ignition wire, but if there is a better option, I need to know which wire to cut.
The turbo button kicks in the motor at maximum output until it is released-- this would be a great way to get up to a speed from whch I can maintain with pedals only-- the automatic setings work well enough for a smooth assist ride, but they are not fast enough to do the accelerating work. I can do this now by accelerating in one gear and downshifting when I reach the speed I want, but I can't do this to get up to speed for the highest gear.
I have been riding the Merida for about 18 months and it has been a good experience. I am currently using a 24v 15ah ping pack that has performed consistently down to air temperatures of 5 degrees Fahrenheit. I added 24v lights and cargo racks, so I can ride at night and carry what I need.
Side note-- people like the bike and the concept of riding to work, but nobody wants to deal with the weather (central Illinois) and traffic. Planning might solve the traffic issue, but the weather will remain.