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Random wires not plugged in

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I just picked up a 93 Loyale and it runs. A little rough but it runs. While looking things over notice there are 3 wire harnesses not plugged in to anything by the fuel filter. Anyone know what they are for? 

1E65A54D-04AB-4EE2-9C8B-3CEA201100C4.jpeg

The single pin white and green ones are for various ECU test modes, leave them disconnected.   The bigger one is for a diagnostic tool to plug into.

Cars in general have MANY unused plugs. They are there for various reasons - usually diagnostics or options that model wasn't equipped with. 

GD

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