Starter won't engage

I recently replaced the TCM on my 03 S500 and now when I try starting the car the key turns and the dash lights up but the starter doesn't engage also I forgot to disconnect the battery when I replaced the TCM and I don't know if that may have caused the problem, I have checked all of the fuses in the car and nothing was blown but the TCM that I replaced was full of transmission fluid. Any help and or advice on how to continue would be greatly appreciated since taking the car to a dealer... Starter won't engage

I recently replaced the TCM on my 03 S500 and now when I try starting the car the key turns and the dash lights up but the starter doesn't engage also I forgot to disconnect the battery when I replaced the TCM and I don't know if that may have caused the problem, I have checked all of the fuses in the car and nothing was blown but the TCM that I replaced was full of transmission fluid. Any help and or advice on how to continue would be greatly appreciated since taking the car to a dealer...

Starter won't engage

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