Just so you know the two actuator may be diffrent. Could it also be cold weather I mean I live in ontario right now its about -13 could that be why the mileage is so terrible? When shifted out of 4wd, the switch opens up and no voltage goes to the actuator. If they are then replace the actuator. Our switches are manufactured under a completely quality control process from componentry to finished products by experienced professional. The wires both look black or dark blue to me I could not tell, But there is not a light blue wire. I hear a shift noise underneath when selecting Lo in Neutral , but no shift noise when selecting Hi. The black wire is shown as hard wired to ground g105.
Looks like the T case is fine after all, so it's probably the actuator, right? I can bearly see the 2wd flash before all three light flash. Pull out the relay and probe the relay socket with a voltmeter. I am not sure how the front end is actuated on this truck, I had an S-10 that locked the front halfshafts with vacuum, there was a vacuum switch on the transfer case that ran to a diaphragm to pull a cable. The following bulletin may interest you if you need to replace the actuator. Or Bad vacuum switch on top of the transfer case.
Nothing I that I do will make the 4wd lock-in. We've worked hard over 11 years designing a website experience that makes it easy for anyone to idenify whether parts fit their car. This is virtually identical to the sum of the comparator voltage divider resistances, R4 plus R5. When I switch to 4wdh the 4wdh light flashes and only that light. Robust design and high grade materials meet the stringent demands of today's service professional.
I am a electrical eng. I want to help you save time and money repairing and maintaining your vehicle. If you know your front axle actuator has had better days, consider browsing the large inventory available on eBay to find a replacement. Once it gets going, it comes right out. If not, repair open in Light Blue wire between front axle solenoid and transfer case switch. An actuator is integral to four-wheel drive vehicles, as it is the device that activates the front axle as well as the four-wheel system in general. See top left of diagram below.
So I verified your procedure and it does work. As a global manufacturer of original equipment ignition products, we maintain complete quality control throughout the manufacturing process from componentry to finished product. Explain the flashing in detail, and I will provide you with the info that I have. Remove T-case 20 amp fuse. If it hasn't ever been replaced then ther is a updated part it come as a kit witha harness spacer and actuator. Ive had this blazer for about a month now its got about 25000 km on a new motor and the gas mileage has been terrible 9 -10 mpg average its alittle hard to start turns over quite a few times before starting but other then that it runs good and no codes. This is the switch you are talking about.
If so, proceed to next step. Now the the truck is in 2wd all the time. Should I get the truck on a lift and make sure my front drive shaft is spining when I engage the 4wheel drive? When I engage the 4wheel drive nothing happens. I un-plugged the connectors at the actuator I am getting around 13vdc when I press the 4wdh or 4wdl buttons. I have tried shifting into 4wd Hi at both a standstill and while moving. Faulty actuator on top of the front diff is worn out.
Anyone else had this issue before I go out and buy an actuator? Let us know how it goes. They will keep flashing until I switch back to 2wd. I don't 4 wheel much except on winter roads when needed. Later I tried to put it back in 4wd and it would not engage. That's going to save you time and money. Jerry Some things I forgot to mention. If I were you, I would buy a new heated actuator.
This vacuum system is prone to failure due to frozen diaphragm, loss of vacuum, hard or cracked vacuum hoses, or complete loss of vacuum lines. You're probably hearing the transfer case motor shifting into 4x4. So what do you think. Same if it is electrical, something that didn't get reconnected after the clutch fix. You might try resetting it by disconnecting the Neg. When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. A couple of days ago I did exactly the same thing and it didnt want to start again sounded like it wanted to but didnt I pulled the fuel pump fuse and reinstalled it and all was well again.