.....,aux battery relay and a manual transmission read on:

    Say you come out of work, turn ignition key and NOTHING happens. NO dash
board lights, nothing.  Damn, left the lights on. Here is what I did.
1>Turn off the head lights.
2>Leave the ignition key on.
3> Access the aux battery relay.
4> Momentarily short across the aux battery relay contacts.
5>Current will flow from the good aux battery to the dead starter battery
and then to the ignition key and instantly pull in and hold the aux battery
relay. You will notice the dashboard lights are now on.
6>Get out and push start the beast.
7> Drive home with smug look on face.
If this happens to you a LOT you might consider installing a momentary
contact pushbutton across said contacts.
Good Luck and drive safely.
Ken Lewis
http://neksiwel.20m.com/