1987 300 SDL,, my car got trashed twice in 7 days so I farmed out the job,, all they would do was the alarm they would not hook up the remote door locks or remote starter,, said there was only 500 mv to the locks and that would not do ,,, I bought a electric door lock from the wreckers,and to relays to up the amps and hope to install that to motivate the lock ,, any thoughts ?