[WildBillyT]

Alex,

When I had the car with the original engine and PCM I had the VATS tuned out of the computer. That took out the TDM.

One day I got stranded because of the starter engagement issue, which is related to the TDR- the relay. I replaced the relay thinking it might fix the issue, but it didn't work. The switch was there to ground out the TDR if I needed some extra security (from what I remember).