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Old 07-07-2020, 06:13 PM   #4
78F350
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Join Date: Jul 2014
Location: Oklahoma
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On the 1997, I see one connection directly between the DME and ABS 5.3, a wht/brn wire "Speed RL" (rear left?) it also connects to the instrument cluster.

DME, Pin 79----- X3/1, Pin 21 ----- ABS, Pin 23
|---Cluster, II 16

My guess is that it is a signal that goes FROM the ABS unit TO the DME. I guess that because the ABS unit has input from 4 wheel speed sensors. The (1997) DME does not get any speed input directly from the wheels, it would have to be through the ABS.
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