RindaTechnologies TechMate Pro User Manual page 55

MerCruiser Thunderbolt V Ignition
Figure 30 Thunderbolt V Data Terminals
Please note that reversing the YELLOW and VIOLET leads will cause the
scan tool to fail to communicate with the module. No damage will occur to
the scan tool or the module, the scan tool will simply display an error message
stating it cannot communicate properly.
4) Connect the BLACK test lead to a good engine ground location. The lower
mounting stud for the Thunderbolt V module, as shown in Figure 29, is a
suitable location for this lead.
Figure 31 Ground Connection
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