Jeff is right you should have 75ma on a 4.2 and 5.6 116/117 v8s, key on engine off.

Maybe the same reason you aren't getting proper idle current is the same as why you can't get 75ma. Its a lot easier to do 3ma than 75ma or 600ma.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician