anyone know how to test a 4wd actuator ?

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 ?
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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.
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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..
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bummer. sorry i was guessing you had pushbutton since it waasn't stated. that was my problem previously. good luck
m
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wrote:

Is this a S10 or fullsized truck because the actuator is vacum on one and thermoeletric on other. ----------------- TheSnoMan.com
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1990 1500 short box full size.
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2 pin plug wiring no vacuum.
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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. ----------------- TheSnoMan.com
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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.

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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. ----------------- TheSnoMan.com
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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. old john 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 hiking boots

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I am gonna put a manual cable style.. you can get em for $50and then you know it is locked in or not.. Looks like a choke cable

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Another nice thing about the newer ones is that they stay engaged when power is removed so they do not need to re-engage if you shut off and restart it in 4wd. ----------------- TheSnoMan.com
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anyone have a pic ,or know a place where I can buy one in Ontario Canda or on ebay ?
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ChEvRoLeT wrote:

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.
--
Steve W.
Near Cooperstown, New York
  Click to see the full signature.
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wrote:

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. ----------------- TheSnoMan.com
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can I hook it up to the "clapper" and when I want 4wd I just clap ?.. just a thought.

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