I´m trying to repair this ECU. It´s PN: 73326G06 (1206MX logic board). I have found the mosfet H bridge damaged, some gate resistors and the driver. This I already replaced but now I have the problem with R66 which is burnt and I can´t know the original value. It´s going to a colector from TIP112 in one side and to J1 pin 1 in another side so it seems it has to do with the forward and reverse selector. Does anyone have this unit or similar to know the value? I think it´s a current limit resistor.
I am just now looking at buying a used golf cart. I understand that these controls can be sent in for overhaul, or a defective unit can be exchanged for a defective one at much less than the cost of a new one...
It appears that the high-current winding in the motor is switched only by a solenoid, while the low-current winding is controlled by the H-Bridge, both for speed-control and reversing...
this is the circuit involved to R66, it´s difficult to follow because the board has 3 or more layers. Should I make a jumper at R66 and try it first or would you select a low value resistor?