by RichD » Tue Dec 06, 2016 7:32 am
Looking at the picture I'll bet that there is nothing wrong with the resistors. If the controller was ever hooked up wrong the resistors could have gotten burned up, however in my experience damaged resistors are obvious. What seems to be lacking is a wiper to select how many resistors would be in the circuit. There is a wiper pad and the resistors are connected to that, but the wiper itself is missing. Lacking the wiper I would expect that the controller has almost no brakes at all unless the brake circuit was hot wired. Looking at the wiper pad there are no marks that would indicate that there was ever a wiper. Some of the PM diode controllers came with a fixed resistor in the brake circuit, the features listed for the controller indicate that variable brakes were an option. Probably those 15 2.2 ohm resistors are always in the brake circuit for a total of 33 ohms. Controllers intended for use with 1/32nd cars usually have a 25 ohm pot in the brake circuit, adding a wiper would make your controller more functional.