Could be a number of things, either the battery you are using isnt adequate, or there cold be some grit in the gearing causing the motors to stall. A number of things. If you can do what Houghy suggested and get yourself a good battery at least 17Ah if you want to use it during a nights observing. Or if you have access to 240v get yourself a good power supply that is rated to around 5A or above. I am guessing this is the oler mount with only the three slew rates?
The switches could be for changing from North to Southern Hemispheres, but not sure why two.....so dont quote me on that hehe...
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