Key wont start car but jumping starter will. Dies if you take screwdriver off

TRY TURNING ENGINE BY HAND

have you changed the soleniod

wont crank or wont start.??
no car starts , if it cant crank. (unless push starter (M/T magic)
that is not a trans sensor its the PRN switch.
ill answer for, wont CRANK !
it wont crank even with a good battery (charged) or jump started.
1: bad start
2: bad wires to same.
so hot wire the starter small wire, the key start line is tiny.
cranks. , starter good, no crank starter bad or cables bad.
if it cranks hot wired, then the key line is dead.
easy, huh?

Sound like a ignition switch problem.

you need a starter solenoid

sounds like it is the starter or ignition switch. To shade tree test the starter you can jump it out with a screwdriver, this is sort of tricky if you have never done it before. Someone will need to turn the key and then you take the screwdriver and tap the posts on the starter, if will arc the screwdriver., but start the vehicle. You can also pull the starter out and have it tested. The see if it is the ignition switch you will need to trace out the wires and make sure they are all working correctly. Good Luck Tim

fuso wiring diagram

sounds like it needs an ignition switch. the reason it dies after a few seconds after jumping the starter is bc the security system from gm thinks you're stealing the car so it kills the fire. the security system goes thru the key so if the switch is bad, it wont run no matter how you try to crank it

If when you jump the starter with a screwdriver & it spins without engaging the flywheel - I would say with reasonable confidence that the starter is bad..

Hope this helps !!
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Do you have a Chip in the Key? if so that Could be the Problem,Ya see the chip is a resistor and if it looses its ELECTRONIC VALUE in its Case Resistance it wont start to test this Turn the Key in the ON posission then do the Screwdriver thing If it Starts Key is Good and Most Likely the Ignition (SWITCH) is Bad <<ELECTRICAL Side NOY LOCKEST SIDE For More Info Recontact Me
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