Medium and Heavy Trucks
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Hi I'm Wayne
I will help you with this
some work off the Alternator, others work off the ECM
I hope this helped you
On the alternator is a terminal "W"
what plug you measuring at 2 wires
where were you measure 3.8 volt on a PLUG
then that is correct voltage 3.0 to 4.9
Sorry for long delay was away
if you have a 1994 KW with out a ECM
you are the only one in the world to have that
so you are saying your whole engine is Mechanical ??