Hi, my brother has an SOB class A motorhome on a Workhorse chassis; He had the same problem, and the fix is an updated ignition switch, an updated pigtail/wire harness/connector, and most importantly a relay to carry the load. The relay carries the load, that in time, overloads the ignition switch and it's connector. So if you just replace the switch and/or the connector, you didn't fix the problem. [RELAY]