Can you engage your 4x4 by not using the electronic push button?
No. The buttons operate the shift motor on the transfer case. The only way would be to swap in a manual transfer case.
1997 jimmy electronic 4 wheel drive will not engage when pushing the botton. What are the possibilities?
The 4wd in the 1999 Chevy blazer is electronic, you just have to push the button. If you have pushed the button and it doesn't engage, it might be a vacuum line. The lines are made of rubber and over time they melt. It costs about $25 for a new metal line. Also, the 4wd is under the battery. If you take the battery out, you might notice that a line got disconnected accidentally.
Depends on if you have the electronic or manual transfer case. The electronic ones, they advertise as "shift on the fly" capable, but this is a really bad idea. Either way, put the vehicle in neutral... if you have manual locking hubs, engage the parking brake and lock the hubs by rotating them clockwise to the "lock" position. Then, if you have the manual transfer case, you pull the transfer case lever either to the…
How do you turn on the 4 wheel drive on a 1990 bronco 5.0 it is a shift on the fly not locking hubs?
A normally open contact is similar to a spring loaded switch, found in push buttons, and relays. For a push button, when you push the button, the button head has a piece of metal that makes contact between two external screws, where the wires are attached. For a relay, the concept is the same, but instead of pushing the button yourself, the relay would be turned on and off by an external electronic device.