I have a 1990 chev 4x4 the actuator wire was unplugged, the guy I bought
the truck from said it was broken... .I plugged it back in to try it but the
4wd does not seem to be engaging.. The light in the shifter to say if it is
in 4wd is not coming on either. I would like to test the actuator manually,
is there any way to force 12volt to it and get ti to engage while unthreaded
from the front diff ?
no it is the floor style you shift it manually and usually a click will
follow and voila 4wd. but the light no longer comes on abnd I am sure the
thing is not working. I checked the fuse. I was wondering if I could put 12v
to it amually and see what it does..
It is thermo-electric. Aplie 12 volts to it directly. On pin is for
the 4x4 indicator light and the other is to engage it. It make some
noise as it engaged and should get warm after a few minutes. These
things fail a lot with age so this is not uncommon.
so unplug it and apply 12v to which side.. I guess I could do 1 at a time
and see what happens.. I have a new one Just would like to know that was the
problem bfore I go ripping parts off.. Figured you would be able to help..
you da man.
I do not have a schematic handy but if you have a ohm meter it will be
terminal with no resistance and the other should read open. You could
also check for power at plug to confirm if it is even getting power.
if you have a new one, make sure it is the new type with a motor driven
actuator and not the old thermo type. as Snowman said, the old ones fail and
even will not engage it the temperature is too low to allow heat expansion.
mine failed when i was buried in cold mud and then had no front wheel drive.
1999 chevrolet tahoe
1989 fs ford bronco
2000 xj jeep cherokee
1988 xj jeep cherokee
1957 fc150 forward control cab over jeep
1955 (highly modified) cj5 jeep
You have the crappy wax pellet style on that truck. Even when they are
new they don't like COLD weather. Nice thing is that GM made a
replacement part that uses a solenoid instead of the wax pellet. Direct
bolt on and they work without fuss. The wax type are a VERY common
failure item. If you don't like either of those types you can also get
an aftermarket kit that replaces the actuator with a cable that you pull
to engage the axle.
The only problem with these aftermarket kits like this is that the
linkages for them are exposed and it is a shame that they did not come
up with a design that was enclosed and that mud, brush or ice could
not possibly interfere with its operation.
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