I have this old RC car I found (it’s around 20 years old). I ripped out all the inside electronics and left the dc motors in place. I can power the dc motor using my uno (powered by a usb power bank) and 8 AA batteries in parallel reading at about 10 V (4 are rechargable, 4 are not) are powering the L293D motor shield. I connected motor 1 pins to the dc motor and managed to get the wheels moving, but then as soon as I put the car down on the ground it doesn’t get enough torque to push the car. So I then thought I’ll use the motor 1 and motor 2 pins in parallel to power the dc motor, as maybe the current wasn’t high enough. I can now occasionally get it to drive the car, but sometimes it just doesn’t (and when that happens, the L293D IC gets hot to touch).
I then did a quick test. I measured the current draw to the motor when I lift the wheels off the ground, and it’s at about 0.5A. I then put it down and measured the current (note, the wheels aren’t moving now), and it’s around 1.1A. What’s going on? Any tips on what else I can try to get it to move!!
EDIT: including picture so you get an idea of the size of the RC car