[zeropointbug]

Yes, the Quark dissipates a lot of heat compared to other controllers, to add to that it's thermal design sucks, mostly from the internal thermal pads, which are mediocre, at best.

So you say the battery cable side? I don't know why that side would be overly hot, usually the motor taps on the pcb are very hot on the Quark.

The best way to cool the Quark is to do the internal mod to it like many here have done. The internal pad is replaced with a thicker one, and is thermal epoxied on. Then use a decent heatsink on it.

BrianG has said he thinks the engineers have sacrificed efficiency with the controller for better firmware (in it's own way i guess), like being cog free, and very smooth in driving.

There really is no 'ultimate truck controller' out there, we are going to have to wait for the MMM, and Tekin to see what they have with their up coming controllers.