SOURCE: trying to install kd-pdr50 into
Hi and welcome to FixYa,
Should you be interested, the installation manual for a JVC KD-PDR50 is available here. The manual has detailed instructions with illustrations for the mechanical mounting.
To my understanding, the always on (constant) + 12 on a '97 Diamante is the red wire from the ignition switch harness. The yellow wire of the JVC must be connected to this. On the other hand, the red wire of the JVC must be connected to blue/red wire of the ignition switch harness. The black wire of the JVC is preferably connected to the metal frame / support or bracket of the dashboard.
The best approach to determine the speaker wires of the Diamante would be to use a continuity tester and check each speaker pair of wires.
Good luck and thank you for asking FixYa.
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