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If you can jump it at the switch and get it to start, then the ignition relay must be working. It is hard to tell from your post but I think you are using power from another source to do this? I am thinking you have a blown fuse on the wire the furnishes power to you ignition switch.
Check the neutral safety switch on the transmission. It should have three wires on the connector (if I remember correctly). There should be power on the Brown with yellow wire with the key in the crank position. If there is ground that wire and see if the van starts. If it does replace the switch. If it does not check the starter relay.
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did the battery check to be good? are the connections on the battery tight and clean? if so you may be getting a bad body control module , it controls power and ground to the systems you are having problems with.also check the ignition switch to see if you are getting power out of it to power the vehicle up.
check the ignition switch. pull covering off of the column and check switches wires,
reds - should have +12 battery power
white - Ignition output pink - ignition output
yellow - starter output
these wires are needed to start car.
from the switch the starter wire goes to and neutral position switch. located on transmission. yellow is starter in purple is starter output. if all that is good change the relay moun about the radiator. good luck
Have you had the ignition switch changed? If the ignition switch is faulty you can have issues getting the car to turn over. Also when driving the car can just shut off. The contacts in the ignition switch just wear out over time. It's a good place to start looking.
95-97 blazer or 94-97 S-10
12volts red (there will be 2)+ ignition harness
Starter purple or yellow + ignition harness
Ignition pink + ignition harness
Second Ignition white or pink/white + ignition harness
Accessory orange + ignition harness
Power Lock lt. blue + either kick panel
Power Unlock white + either kick panel
Lock Motor gray drivers kick panel
Unlock Motor tan drivers kick panel
Parking Lights+ brown switch or rear harness
Door Trigger white - keyless module
Dome Supervision use door trigger
Trunk/Hatch Pin tied in with doors
Trunk/Hatch Release black/white + switch or keyless
Tachometer white AC ECM
Brake Wire white + at brake pedal switch
Parking Brake black at the pedal
Horn Trigger black - steering column
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