OOps!...My mistake I was thinking of another wire....Yours does go into the bundle...
Yes...There is a connector you can unhook about a foot and a half along the wire leaving the fan cage.....Just unhook the connector...only a two conductor cable...You can hook 12 volts + & - to the cable either way...the fan will run both directions as a test....

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1978 Yellow 300D (The Mustard Toad)
1980 Blue 240D (The Iron Toad)
1989 Grey Mitsu.4WD Mighty Max Pickup (Needs a Diesel transplant bad)

(Open the pod bay doors HAL)