Quote:
Originally Posted by pugs
if it does work the servo ok on the throttle channel then its speedo, running full all the time is usually the brake fet blown in brushed speedos.... if you know how to use a dvm unsolder the motor and test from battery neg to motor neg, if it reads short then its brake fet in the speedo 
hope this helps  |
Running all the time can be caused by one of the forward drive FETs being blown as these switch the battery negative to the motor negative.
If the brake FET was blown short circuit (motor negative to motor positive, the forward FETs would get hot when throttle was applied because the blown FET would be shorting them out.