My '97 Tahoe, with 5.7 L, started blowing the fuse when engaging the 4x4 and
would not engage. When I disconnected the actualor, the short would go away.
Dealer sold me the "new and improved" electromechanical actuator with the
necessary retrofit wiring harness, but no instructions or diagrams on how to do
Anybody have a wiring diagram or instruction sheet that explains the
installation of the new actuator with its harness?
I would hate to do a smoke test...
Unscrew the old actuator, take the metal spacer that should come with
the new updated wiring harness and install that into the front diff first,
then install the new actuator. Take a look at the new wiring harness,
it's fairly foolproof at the one end, one plug goes into the new actuator,
one plug goes into the old harness that the original actuator plugged into.
Now you need to route the wiring harness back along the passenger side
of the trans, and up and over the t/case. Find the switch sitting at the
top of the t/case...(it's not actually right at the top, more like halfway
between the mainshaft and the front output shaft, but it is on the top
of the case, sticking up), unplug it and find the brown wire. There should
be only three wires I think, you need to splice the brown wire from the
new harness into the brown wire in that t/case switch connector.
Should work fine from there.
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