Martin, I spent a little time with the door lock module, but all I have had trouble with was the door lock when used inside the car. I had determined it was the linkage and all the mechanical things going on. I have never had trouble when locking from the outside. Your correct about the arching, most people don't know there are relay's inside the module that should be replaced due to the arching. If you will look on my web site, I have original relays and replacement just like you may have. Bosch told me they were the same 40amp but rated different in certain applications. As far as the circuit breaker, If you will put a 10 or 15 amp breaker in, then if it hangs up, you won't burn up something waiting on the breaker to trip. I run 10 amp in mine with no trouble and when I simulated the problem, it tripped quick. No burning up the module or wires.I never had the time yet to make the mod's in the archive but they looked good. I would like to know how it turnes out. John Hervey http://www.specialtauto.com/talk-view.shtml