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Re: Allison 2000 Series Check Trans light / No crank / No shift
Posted to HD/Fleet Forum on 7/31/2020

Heres what i found: I have 4.9V on the black wire at internal mode switch which is also connected to the temperature thermistor and goes to pin 58 of the TCU. The wiring diagram i have shows that to be ground... If I ground that wire, the gear indicator indica... Login to read more.