Thanks mrmiata. To clarify the car turned over 2 times maybe even 3 with immediate stall the nothing but click after resetting battery. I haven't replaced the cps just to rule out otherwise not sure what to do next destined for dealer or Mercedes mechanic who knows crossfires. Not daily driver so no rush but just purchased car and feel snake bitten. My daily driver is ford focus st so holding me over for now. Any suggestions or ideas appreciated. I'm trying to use forum properly being a newbie. My nephew who is a mechanic traced the horn dome light and skreem link. I don't know if it is relevant