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 ?

On Mar 19, 11:04 pm, "ChEvRoLeT" <lblo... (AT) cogeco (DOT) ca> wrote:
if it's the 4x4 pushbutton kind. look under the battery tray. the
actuator is under there. there is probably a rip in it. =if no rip
check the vacuum lines connected to it.

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..
"vwtopdown" <vwtopdown (AT) gmail (DOT) com> wrote

On Mar 20, 10:31 am, "ChEvRoLeT" <lblo... (AT) cogeco (DOT) ca> wrote:
bummer. sorry i was guessing you had pushbutton since it waasn't
stated. that was my problem previously. good luck

m

On 20 Mar 2007 07:35:19 -0700, "vwtopdown" <vwtopdown (AT) gmail (DOT) com>
wrote:


Is this a S10 or fullsized truck because the actuator is vacum on one
and thermoeletric on other.
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TheSnoMan.com

1990 1500 short box full size.
"SnoMan" <admin (AT) snoman (DOT) com> wrote

2 pin plug wiring no vacuum.
"ChEvRoLeT" <lblower (AT) cogeco (DOT) ca> wrote

On Tue, 20 Mar 2007 12:54:45 -0400, "ChEvRoLeT" <lblower (AT) cogeco (DOT) ca>
wrote:


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.
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TheSnoMan.com

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.

"SnoMan" <admin (AT) snoman (DOT) com> wrote

On Tue, 20 Mar 2007 14:02:29 -0400, "ChEvRoLeT" <lblower (AT) cogeco (DOT) ca>
wrote:


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.
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TheSnoMan.com