[R129 SL] 300SL computer protection circuit.

[s Khuraij]

Does anybody know where the computer protection circuitry is within the 
box housing and how to reset it (the protection).

My car was at the body shop and they had to jump it.
I think they mixed the terminals and the protection circuit breaker
relay kicked in.  I know at least that when this happens the check 
engine light does not come on when you turn ignition to position 2.
And the car becomes difficult to start, does not run well etc.