'69 L78 Camaro negative battery cable hookup

[JHS]

According to the 1969 assembly manual in the L78 section showing the battery cable hookups, the diagram APPEARS to show the negative cable being attached to the upper alternator adjusting bracket where the heater hose bracket is attached. I have never seen this in pics or real life before so am unsure as to the proper location to hook up the cable. Most connections I have seen are to the water ppump but...