Porsche 928 ST1991 Owner's Manual page 99

Start assist connecting points sequence
On right side of engine compartment you will
find a positive (+) battery post (remote con-
nection).
First connect clamp at end of positive (+)
cable to the remote connection in the en-
gine compartment (+ arrow). Then con-
nect clamp at other end of positive (+)
cable to the positive (+) terminal of the
booster battery.
98
Next connect clamp at end of negative (-)
cable to the negative (-) terminal of the
booster battery. Then connect clamp at
other end of negative (-) cable to the en-
gine compartment strut rod (- arrow).
Caution: The cable clamps must not con-
tact each other, and the plus-cable leading
to the positive (+) post must not contact any
metal pan of the car.
Caution: Do not try to start car by pushing
or towing. Damage to the catalytic converter
and other components of the car may result.