I am having some issues on a SP it was shutting down intermittently found the tow drive switch bad on the distribution board replaced board ran good for a few months and shut down all together now when you depress the dead man pedal the K3 relay goes crazy trying to close the coil is only getting 9 volts if you run coil alone it will close as soon as you hook up K3A wires is when it acts up. I have changed out the board brake coil and the brake module. checked all connections on the card and board. unit is still failing I am wondering if any one else has encountered a similar issue in the past.