Chevrolet 1993 Corvette Owner's Manual page 207

Problems on the Road
3.
Turn off the ignition on both
vehicles. Turn off all lights that aren't
needed, and radios. This will avoid
sparks and help save both batteries.
And it could
save
your radio!
4.
Open the hoods and locate the
batteries.
Find the positive
{
+
j and, negative
(-) terminals on each battery.