my dsp5 is not switching tunes i checked can rechecked to make sure that the wires where in the right holes. I have taken a meter to them and got resistance and the resistance would chang when swithing the switch. On my lap top i have tryed to log data from the dsp voltage and it wont log anything saying that one that one pid has been selected and i checked to see if anything else was selected and nothing was and it also said to change the scanning speed. Only one of the tunes was able to be loaded to the truck.. Anyone got any ideas why the other tunes are not loading or what could be wrong