AM radio dealer option wiring

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When adding the Toyota CB, cassette or 8-track player this spade connector connects to those units. When the external unit it activated the radio turns off and the unit is ready for use.

I believe the blue wire and connector coming out the harness is power
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That connector is correct for the "Radio" connector for 1973-1977 FJ40's and it is connected to the Wiper fuse circuit for those same years.
The Radio got it's own fuse in 1978.
 
Toyota probably had a surplus of the slotted connector, and since it will fit the male connector on the expansion harness for a tape deck they used it. Or the woman assembling the harness simply grabbed the wrong connector. Interestingly I have seen mutiple harnesses that have a female bullet connector installed there instead of the white connector.
I have the non slotted version of that connector if it bugs you and you want to swap it out. Part # F1P6.3W or you can install a latching 1 pin Part #FLF1P6.3W
 
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