The terminology in this thread is a little confusing.
Here is a copy
of a typical BIRD system (All I can find is the gas
version), Your Mileage May Vary.
On the last page shows the "typical" three disconnects, Coach (house) Disconnect; Isolator Relay (some call Emergency Start); Chassis Disconnect.
Now the Chassis and Coach disconnects are operated from near the door or where you may have some central control system (you did not answer when asked) and usually the Emergency Start switch (one way to control the Isolator Relay) is on the dash by the steering column.
So what is it you have in addition to a BIRD (if you found it)? Pics are always nice.