Wild Thumper --Voltage drop with no current
May 22, 2011
So this is a new one... and sorta weird.
When I run my motors (or really, just the left channel) of my Wild Thumper controller, I am getting a major Voltage suck but no increase in current. I have tried the standard motor swap (potentially bad with known good), replaced the wires going to the motor(s) and tried both the SLA batt (fully charged) and my desktop power supply. I have also watched the voltage level via the power supply itself, a meter and via the wild thumper itself. All readings agree --We go from 12.5V to around 6.5 or 7v at the start up of the left motor. At the same time, also checked with different "meters", I am only drawing 3A from that motor (actually, both motors are drawing the same --about 3A or so with no load). The problem exists in both Fwd and Rev.
I simply don't have the eletrical engineering knowlege to know what is going on here. I need someone to go all ohm's-law on this problem.
BTW --The wild thumper, in the end, is a dual H-bridge made up of big-honkin' FET's in pretty-much the "standard" configuration.
Am I missing something simple here? If it is as simple as just a blown transistor, I would like to isolate the problem a bit before I whip out the desolder braid. And I gotta add... Drill motors are really friggin' hard on motor drivers.