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I really didn't want to use the aftermarket microphone that came with my used radio. So I figured out how to power the stock microphone and route its signal to my aftermarket radio. I did not make any modifications to the OEM equipment to make this work. Everything I tweaked is an aftermarket wire or connector.
I cut the connector off the aftermarket microphone and soldered the shielding and wire to some pins that I removed from the connector. These connect to Pin 5 (+) and 19 (-) on the 28 pin connector.
I also soldered a USB 5V output and ground to some extra pins and used these these in place of the original amplification circuit. The 5V connects to "MACC" via pin 4. The USB ground connects to "SNS2" via pin 6.