connect 2 wire from 90 amp mercrusier to a 145 amp 4 pin connector

by chuck
(hiltohead island sc)

alt.. 145 amp for a new chevy trailblazer gmc envoy alt.

2 wires purple from power w/ignition on exite field.
red purple from ign to instrunent pannel 12 volt gauge.
i was told i only needed 1 wire from ignition to i pin.
output to 12 volt on stater from battery, no output, just a draw from engine running
what pin should the re/purple connect to?
tried with just power to i pin,no output
i installed the 145 amp on my 1997 sea ray sundancer w/5.7 engine,i/o rhanks for your input

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